This is a list of the
evolution of the borderBorders define geographic boundaries of political entities or legal jurisdictions, such as governments, sovereign states, federated states and other subnational entities. Some borders—such as a state's internal administrative borders, or inter-state borders within the Schengen Area—are open and...
s of the United StatesThe United States of America is a federal constitutional republic comprising fifty states and a federal district...
. This lists each change to the internal and external borders of the country, as well as status and name changes. It also shows the surrounding areas that eventually became part of the United States. Each stage has a map, to show what the specific makeup of the country was at any given time.
After achieving independence with the
Treaty of ParisThe Treaty of Paris, signed on September 3, 1783, ended the American Revolutionary War between Great Britain on the one hand and the United States of America and its allies on the other. The other combatant nations, France, Spain and the Dutch Republic had separate agreements; for details of...
, the United States expanded westward, enlarging its borders seven times, with two major border adjustments, one each with colonies of the
United KingdomThe United Kingdom of Great Britain and Northern IrelandIn the United Kingdom and Dependencies, other languages have been officially recognised as legitimate autochthonous languages under the European Charter for Regional or Minority Languages...
and
SpainSpain , officially the Kingdom of Spain languages]] under the European Charter for Regional or Minority Languages. In each of these, Spain's official name is as follows:;;;;;;), is a country and member state of the European Union located in southwestern Europe on the Iberian Peninsula...
, and several small disputes. The original thirteen states grew into fifty
statesA U.S. state is any one of the 50 federated states of the United States of America that share sovereignty with the federal government. Because of this shared sovereignty, an American is a citizen both of the federal entity and of his or her state of domicile. Four states use the official title of...
, most of which began as
incorporated territoriesTerritories of the United States are one of the four types of political division of the United States, overseen directly by the federal government of the United States and not any part of a U.S. state. These territories were created to govern newly acquired land while the borders of the United...
. The general pattern seen in this is of territorial expansion, carving of organized territories from the newly acquired land, modification of the borders of these territories, and eventual statehood. Only two states,
NevadaNevada is a state in the western, mountain west, and southwestern regions of the United States. With an area of and a population of about 2.7 million, it is the 7th-largest and 35th-most populous state. Over two-thirds of Nevada's people live in the Las Vegas metropolitan area, which contains its...
and
MissouriMissouri is a US state located in the Midwestern United States, bordered by Iowa, Illinois, Kentucky, Tennessee, Arkansas, Oklahoma, Kansas and Nebraska. With a 2010 population of 5,988,927, Missouri is the 18th most populous state in the nation and the fifth most populous in the Midwest. It...
, grew appreciably after statehood, and five,
GeorgiaGeorgia is a state located in the southeastern United States. It was established in 1732, the last of the original Thirteen Colonies. The state is named after King George II of Great Britain. Georgia was the fourth state to ratify the United States Constitution, on January 2, 1788...
,
MassachusettsThe Commonwealth of Massachusetts is a state in the New England region of the northeastern United States of America. It is bordered by Rhode Island and Connecticut to the south, New York to the west, and Vermont and New Hampshire to the north; at its east lies the Atlantic Ocean. As of the 2010...
,
North CarolinaNorth Carolina is a state located in the southeastern United States. The state borders South Carolina and Georgia to the south, Tennessee to the west and Virginia to the north. North Carolina contains 100 counties. Its capital is Raleigh, and its largest city is Charlotte...
,
TexasTexas is the second largest U.S. state by both area and population, and the largest state by area in the contiguous United States.The name, based on the Caddo word "Tejas" meaning "friends" or "allies", was applied by the Spanish to the Caddo themselves and to the region of their settlement in...
, and
VirginiaThe Commonwealth of Virginia , is a U.S. state on the Atlantic Coast of the Southern United States. Virginia is nicknamed the "Old Dominion" and sometimes the "Mother of Presidents" after the eight U.S. presidents born there...
, lost land, in each case to form new states.
18th century
March 4, 1789
The
United States ConstitutionThe Constitution of the United States is the supreme law of the United States of America. It is the framework for the organization of the United States government and for the relationship of the federal government with the states, citizens, and all people within the United States.The first three...
came into effect, forming the new nation. Note that the states ratified at different times, but to simplify the map, the final result is shown here.
The United States achieved independence from the
Kingdom of Great BritainThe former Kingdom of Great Britain, sometimes described as the 'United Kingdom of Great Britain', That the Two Kingdoms of Scotland and England, shall upon the 1st May next ensuing the date hereof, and forever after, be United into One Kingdom by the Name of GREAT BRITAIN. was a sovereign...
with the
Treaty of ParisThe Treaty of Paris, signed on September 3, 1783, ended the American Revolutionary War between Great Britain on the one hand and the United States of America and its allies on the other. The other combatant nations, France, Spain and the Dutch Republic had separate agreements; for details of...
on September 3, 1783, which established that the thirteen colonies were sovereign and independent states. The borders were established by Article 2 of the treaty, but with a couple of issues. First, it stated that the border would run west from the
Lake of the WoodsLake of the Woods is a lake occupying parts of the Canadian provinces of Ontario and Manitoba and the U.S. state of Minnesota. It separates a small land area of Minnesota from the rest of the United States. The Northwest Angle and the town of Angle Township can only be reached from the rest of...
to the
Mississippi RiverThe Mississippi River is the largest river system in North America. Flowing entirely in the United States, this river rises in western Minnesota and meanders slowly southwards for to the Mississippi River Delta at the Gulf of Mexico. With its many tributaries, the Mississippi's watershed drains...
- at the time, it was not known that the headwaters of the Mississippi lay south of such a line, so the border has since been taken to run south from the lake to the river.
Some peculiarities to point out to those familiar only with the current borders: Many states had sea-to-sea grants from the British crown that they would not give up easily, so prior to this date, they
ceded this landThe state cessions are those areas of the United States that the separate states ceded to the federal government in the late 18th and early 19th century...
to the federal government in exchange for their
Revolutionary WarThe American Revolutionary War , the American War of Independence, or simply the Revolutionary War, began as a war between the Kingdom of Great Britain and thirteen British colonies in North America, and ended in a global war between several European great powers.The war was the result of the...
debts. However,
GeorgiaGeorgia is a state located in the southeastern United States. It was established in 1732, the last of the original Thirteen Colonies. The state is named after King George II of Great Britain. Georgia was the fourth state to ratify the United States Constitution, on January 2, 1788...
did not do so until much later, and
ConnecticutConnecticut is a state in the New England region of the northeastern United States. It is bordered by Rhode Island to the east, Massachusetts to the north, and the state of New York to the west and the south .Connecticut is named for the Connecticut River, the major U.S. river that approximately...
ceded most land but kept its Western Reserve. Virginia ceded its claim to the territory north and west of the
Ohio RiverThe Ohio River is the largest tributary, by volume, of the Mississippi River. At the confluence, the Ohio is even bigger than the Mississippi and, thus, is hydrologically the main stream of the whole river system, including the Allegheny River further upstream...
, and this land became
unorganized territoryAn unorganized territory is a region of land without a "normally" constituted system of government. This does not mean that the territory has no government at all or that it is unclaimed territory...
.
North CarolinaNorth Carolina is a state located in the southeastern United States. The state borders South Carolina and Georgia to the south, Tennessee to the west and Virginia to the north. North Carolina contains 100 counties. Its capital is Raleigh, and its largest city is Charlotte...
also ceded its claim to its western counties, but this was not officially accepted by Congress until 1790.
New YorkNew York is a state in the Northeastern region of the United States. It is the nation's third most populous state. New York is bordered by New Jersey and Pennsylvania to the south, and by Connecticut, Massachusetts and Vermont to the east...
ceded its claim on the
Erie TriangleThe Erie Triangle is a tract of American land that was the subject of several competing colonial-era claims and which was eventually acquired by the U.S. federal government and sold to Pennsylvania so that the state would have access to a freshwater port on Lake Erie...
to the federal government. At this point in history, all of the states except for Georgia and Virginia were at their present-day borders, except for some of the minor issues mentioned above.
West FloridaWest Florida was a region on the north shore of the Gulf of Mexico, which underwent several boundary and sovereignty changes during its history. West Florida was first established in 1763 by the British government; as its name suggests it largely consisted of the western portion of the region...
claimed a border further north than what the United States said it had. Its border had been 31° north when Spain ceded it to the
United KingdomThe United Kingdom of Great Britain and Northern IrelandIn the United Kingdom and Dependencies, other languages have been officially recognised as legitimate autochthonous languages under the European Charter for Regional or Minority Languages...
. The British later moved its border north to 32°38′ latitude, but when
Spanish FloridaSpanish Florida refers to the Spanish territory of Florida, which formed part of the Captaincy General of Cuba, the Viceroyalty of New Spain, and the Spanish Empire. Originally extending over what is now the southeastern United States, but with no defined boundaries, la Florida was a component of...
was ceded back to
SpainThe Spanish Empire comprised territories and colonies administered directly by Spain in Europe, in America, Africa, Asia and Oceania. It originated during the Age of Exploration and was therefore one of the first global empires. At the time of Habsburgs, Spain reached the peak of its world power....
in the
Treaty of ParisThe Treaty of Paris, signed on September 3, 1783, ended the American Revolutionary War between Great Britain on the one hand and the United States of America and its allies on the other. The other combatant nations, France, Spain and the Dutch Republic had separate agreements; for details of...
, the British cited the original border at the
31st parallel northThe 31st parallel north is a circle of latitude that is 31 degrees north of the Earth's equatorial plane. It crosses Africa, Asia, the Pacific Ocean, North America and the Atlantic Ocean.Part of the border between Iran and Iraq is defined by the parallel....
, but Spain continued to claim the higher border. Also, the borders at the northern area of the Maine District of
MassachusettsThe Commonwealth of Massachusetts is a state in the New England region of the northeastern United States of America. It is bordered by Rhode Island and Connecticut to the south, New York to the west, and Vermont and New Hampshire to the north; at its east lies the Atlantic Ocean. As of the 2010...
and the area northwest of
Lake SuperiorLake Superior is the largest of the five traditionally-demarcated Great Lakes of North America. It is bounded to the north by the Canadian province of Ontario and the U.S. state of Minnesota, and to the south by the U.S. states of Wisconsin and Michigan. It is the largest freshwater lake in the...
remained disputed.
The WedgeThe Wedge is a small tract of land along the borders of Delaware, Maryland and Pennsylvania. Ownership of the land was disputed until 1921; it is now recognized as part of Delaware. The tract was created primarily due to the shortcomings of contemporary surveying techniques...
, disputed since the 17th century, remained a point of contention between
DelawareDelaware is a U.S. state located on the Atlantic Coast in the Mid-Atlantic region of the United States. It is bordered to the south and west by Maryland, and to the north by Pennsylvania...
and
PennsylvaniaThe Commonwealth of Pennsylvania is a U.S. state that is located in the Northeastern and Mid-Atlantic regions of the United States. The state borders Delaware and Maryland to the south, West Virginia to the southwest, Ohio to the west, New York and Ontario, Canada, to the north, and New Jersey to...
.
The
Vermont RepublicThe term Vermont Republic has been used by later historians for the government of what became modern Vermont from 1777 to 1791. In July 1777 delegates from 28 towns met and declared independence from jurisdictions and land claims of British colonies in New Hampshire and New York. They also...
was a complex matter, with areas being claimed by
New YorkNew York is a state in the Northeastern region of the United States. It is the nation's third most populous state. New York is bordered by New Jersey and Pennsylvania to the south, and by Connecticut, Massachusetts and Vermont to the east...
and
New HampshireNew Hampshire is a state in the New England region of the northeastern United States of America. The state was named after the southern English county of Hampshire. It is bordered by Massachusetts to the south, Vermont to the west, Maine and the Atlantic Ocean to the east, and the Canadian...
, but it existed as a
de factoDe facto is a Latin expression that means "concerning fact." In law, it often means "in practice but not necessarily ordained by law" or "in practice or actuality, but not officially established." It is commonly used in contrast to de jure when referring to matters of law, governance, or...
unrecognized independent state.
August 7, 1789
The United States Congress affirmed the organization of the Territory North West of the Ohio River, or
Northwest TerritoryThe Territory Northwest of the River Ohio, more commonly known as the Northwest Territory, was an organized incorporated territory of the United States that existed from July 13, 1787, until March 1, 1803, when the southeastern portion of the territory was admitted to the Union as the state of Ohio...
, under the terms of the
Northwest OrdinanceThe Northwest Ordinance was an act of the Congress of the Confederation of the United States, passed July 13, 1787...
. Northwest Territory consisted of present-day
IllinoisIllinois is the fifth-most populous state of the United States of America, and is often noted for being a microcosm of the entire country. With Chicago in the northeast, small industrial cities and great agricultural productivity in central and northern Illinois, and natural resources like coal,...
,
IndianaIndiana is a US state, admitted to the United States as the 19th on December 11, 1816. It is located in the Midwestern United States and Great Lakes Region. With 6,483,802 residents, the state is ranked 15th in population and 16th in population density. Indiana is ranked 38th in land area and is...
,
MichiganMichigan is a U.S. state located in the Great Lakes Region of the United States of America. The name Michigan is the French form of the Ojibwa word mishigamaa, meaning "large water" or "large lake"....
, northeastern
MinnesotaMinnesota is a U.S. state located in the Midwestern United States. The twelfth largest state of the U.S., it is the twenty-first most populous, with 5.3 million residents. Minnesota was carved out of the eastern half of the Minnesota Territory and admitted to the Union as the thirty-second state...
, most of
OhioOhio is a Midwestern state in the United States. The 34th largest state by area in the U.S.,it is the 7th‑most populous with over 11.5 million residents, containing several major American cities and seven metropolitan areas with populations of 500,000 or more.The state's capital is Columbus...
, and
WisconsinWisconsin is a U.S. state located in the north-central United States and is part of the Midwest. It is bordered by Minnesota to the west, Iowa to the southwest, Illinois to the south, Lake Michigan to the east, Michigan to the northeast, and Lake Superior to the north. Wisconsin's capital is...
. The Northwest Territory had previously been organized under the
Articles of ConfederationThe Articles of Confederation, formally the Articles of Confederation and Perpetual Union, was an agreement among the 13 founding states that legally established the United States of America as a confederation of sovereign states and served as its first constitution...
on July 13, 1787, and was slightly modified under the new Constitution.
April 2, 1790
Congress accepts
North CarolinaNorth Carolina is a state located in the southeastern United States. The state borders South Carolina and Georgia to the south, Tennessee to the west and Virginia to the north. North Carolina contains 100 counties. Its capital is Raleigh, and its largest city is Charlotte...
's cession of its western counties, which had initially been ceded on December 22, 1789. The land became unorganized territory.
May 26, 1790
The Southwest Ordinance organized the Territory South of the Ohio River, or
Southwest TerritoryThe Territory South of the River Ohio, more commonly known as the Southwest Territory, was an organized incorporated territory of the United States that existed from May 26, 1790, until June 1, 1796, when it was admitted to the United States as the State of Tennessee.The Southwest Territory was...
, which corresponded to present-day
TennesseeTennessee is a U.S. state located in the Southeastern United States. It has a population of 6,346,105, making it the nation's 17th-largest state by population, and covers , making it the 36th-largest by total land area...
.
March 4, 1791
The
Vermont RepublicThe term Vermont Republic has been used by later historians for the government of what became modern Vermont from 1777 to 1791. In July 1777 delegates from 28 towns met and declared independence from jurisdictions and land claims of British colonies in New Hampshire and New York. They also...
, which had portions claimed by
New YorkNew York is a state in the Northeastern region of the United States. It is the nation's third most populous state. New York is bordered by New Jersey and Pennsylvania to the south, and by Connecticut, Massachusetts and Vermont to the east...
and
New HampshireNew Hampshire is a state in the New England region of the northeastern United States of America. The state was named after the southern English county of Hampshire. It is bordered by Massachusetts to the south, Vermont to the west, Maine and the Atlantic Ocean to the east, and the Canadian...
and, while unrecognized by the United States, was a
de facto independent country, was admitted as the 14th state,
VermontVermont is a state in the New England region of the northeastern United States of America. The state ranks 43rd in land area, , and 45th in total area. Its population according to the 2010 census, 630,337, is the second smallest in the country, larger only than Wyoming. It is the only New England...
.
September 9, 1791
The District of Columbia, the nation's
federal districtFederal districts are a type of administrative division of a federation, under the direct control of a federal government. They exist in various countries and states all over the world.-United States:...
, was formed from land granted by
MarylandMaryland is a U.S. state located in the Mid Atlantic region of the United States, bordering Virginia, West Virginia, and the District of Columbia to its south and west; Pennsylvania to its north; and Delaware to its east...
and
VirginiaThe Commonwealth of Virginia , is a U.S. state on the Atlantic Coast of the Southern United States. Virginia is nicknamed the "Old Dominion" and sometimes the "Mother of Presidents" after the eight U.S. presidents born there...
; the Virginia portion would be
returnedDistrict of Columbia retrocession is the process of returning the land that was given to the federal government for the original purpose of creating the national capital. The District of Columbia was formed in 1791 from of land ceded by the states of Maryland and Virginia in accordance with the...
in 1847.
March 3, 1792
The federal government sold the
Erie TriangleThe Erie Triangle is a tract of American land that was the subject of several competing colonial-era claims and which was eventually acquired by the U.S. federal government and sold to Pennsylvania so that the state would have access to a freshwater port on Lake Erie...
to
PennsylvaniaThe Commonwealth of Pennsylvania is a U.S. state that is located in the Northeastern and Mid-Atlantic regions of the United States. The state borders Delaware and Maryland to the south, West Virginia to the southwest, Ohio to the west, New York and Ontario, Canada, to the north, and New Jersey to...
.
June 1, 1792
The western counties of
VirginiaThe Commonwealth of Virginia , is a U.S. state on the Atlantic Coast of the Southern United States. Virginia is nicknamed the "Old Dominion" and sometimes the "Mother of Presidents" after the eight U.S. presidents born there...
beyond the
Appalachian MountainsThe Appalachian Mountains #Whether the stressed vowel is or ,#Whether the "ch" is pronounced as a fricative or an affricate , and#Whether the final vowel is the monophthong or the diphthong .), often called the Appalachians, are a system of mountains in eastern North America. The Appalachians...
were split off and admitted as the 15th state,
KentuckyThe Commonwealth of Kentucky is a state located in the East Central United States of America. As classified by the United States Census Bureau, Kentucky is a Southern state, more specifically in the East South Central region. Kentucky is one of four U.S. states constituted as a commonwealth...
.
January 11, 1794
In the third
Nootka ConventionThe Nootka Conventions were a series of three agreements between the Kingdom of Spain and the Kingdom of Great Britain, signed in the 1790s which averted a war between the two empires over overlapping claims to portions of the Pacific Northwest coast of North America.The claims of Spain dated back...
Spain surrenders its exclusive claim to the entire Pacific Coast and acknowledges the right of Britain or other powers to use unoccupied territory.
October 27, 1795
Pinckney's TreatyPinckney's Treaty, also known as the Treaty of San Lorenzo or the Treaty of Madrid, was signed in San Lorenzo de El Escorial on October 27, 1795 and established intentions of friendship between the United States and Spain. It also defined the boundaries of the United States with the Spanish...
,
also known as the Treaty of San Lorenzo, signed on October 27, 1795, and proclaimed on August 3, 1796, settles the northern border of
West FloridaWest Florida was a region on the north shore of the Gulf of Mexico, which underwent several boundary and sovereignty changes during its history. West Florida was first established in 1763 by the British government; as its name suggests it largely consisted of the western portion of the region...
as the
31st parallelThe 31st parallel north is a circle of latitude that is 31 degrees north of the Earth's equatorial plane. It crosses Africa, Asia, the Pacific Ocean, North America and the Atlantic Ocean.Part of the border between Iran and Iraq is defined by the parallel....
.
June 1, 1796
The
Southwest TerritoryThe Territory South of the River Ohio, more commonly known as the Southwest Territory, was an organized incorporated territory of the United States that existed from May 26, 1790, until June 1, 1796, when it was admitted to the United States as the State of Tennessee.The Southwest Territory was...
was admitted as the 16th state,
TennesseeTennessee is a U.S. state located in the Southeastern United States. It has a population of 6,346,105, making it the nation's 17th-largest state by population, and covers , making it the 36th-largest by total land area...
.
April 7, 1798
Due to the Yazoo Land Fraud, an act was signed by
PresidentThe President of the United States of America is the head of state and head of government of the United States. The president leads the executive branch of the federal government and is the commander-in-chief of the United States Armed Forces....
John AdamsJohn Adams was an American lawyer, statesman, diplomat and political theorist. A leading champion of independence in 1776, he was the second President of the United States...
, authorizing him to appoint commissioners to negotiate with
GeorgiaGeorgia is a state located in the southeastern United States. It was established in 1732, the last of the original Thirteen Colonies. The state is named after King George II of Great Britain. Georgia was the fourth state to ratify the United States Constitution, on January 2, 1788...
about ceding its
western landThe Yazoo lands were the sparsely-populated central and western areas of the U.S. state of Georgia, when its western border stretched back to the Mississippi River. It was named for the Yazoo tribe of Native Americans. Several other places and things were named Yazoo, either for or along with the...
. The act created
Mississippi TerritoryThe Territory of Mississippi was an organized incorporated territory of the United States that existed from April 7, 1798, until December 10, 1817, when the final extent of the territory was admitted to the Union as the state of Mississippi....
in the region ceded by
West FloridaWest Florida was a region on the north shore of the Gulf of Mexico, which underwent several boundary and sovereignty changes during its history. West Florida was first established in 1763 by the British government; as its name suggests it largely consisted of the western portion of the region...
, corresponding to roughly the southern third of present-day
MississippiMississippi is a U.S. state located in the Southern United States. Jackson is the state capital and largest city. The name of the state derives from the Mississippi River, which flows along its western boundary, whose name comes from the Ojibwe word misi-ziibi...
and
AlabamaAlabama is a state located in the southeastern region of the United States. It is bordered by Tennessee to the north, Georgia to the east, Florida and the Gulf of Mexico to the south, and Mississippi to the west. Alabama ranks 30th in total land area and ranks second in the size of its inland...
except their
panhandleA panhandle is an informal geographic term for an elongated arm-like protrusion of a geo-political entity, such as a subnational entity or a sovereign state.-Term:...
s, which were part of West Florida.
1800s
July 4, 1800
Indiana TerritoryThe Territory of Indiana was an organized incorporated territory of the United States that existed from July 4, 1800, until November 7, 1816, when the southern portion of the territory was admitted to the Union as the state of Indiana....
was formed from the western portion of
Northwest TerritoryThe Territory Northwest of the River Ohio, more commonly known as the Northwest Territory, was an organized incorporated territory of the United States that existed from July 13, 1787, until March 1, 1803, when the southeastern portion of the territory was admitted to the Union as the state of Ohio...
. It corresponded to present-day
IllinoisIllinois is the fifth-most populous state of the United States of America, and is often noted for being a microcosm of the entire country. With Chicago in the northeast, small industrial cities and great agricultural productivity in central and northern Illinois, and natural resources like coal,...
,
IndianaIndiana is a US state, admitted to the United States as the 19th on December 11, 1816. It is located in the Midwestern United States and Great Lakes Region. With 6,483,802 residents, the state is ranked 15th in population and 16th in population density. Indiana is ranked 38th in land area and is...
, northeastern
MinnesotaMinnesota is a U.S. state located in the Midwestern United States. The twelfth largest state of the U.S., it is the twenty-first most populous, with 5.3 million residents. Minnesota was carved out of the eastern half of the Minnesota Territory and admitted to the Union as the thirty-second state...
, and
WisconsinWisconsin is a U.S. state located in the north-central United States and is part of the Midwest. It is bordered by Minnesota to the west, Iowa to the southwest, Illinois to the south, Lake Michigan to the east, Michigan to the northeast, and Lake Superior to the north. Wisconsin's capital is...
, as well as the western half of the Lower Peninsula of
MichiganMichigan is a U.S. state located in the Great Lakes Region of the United States of America. The name Michigan is the French form of the Ojibwa word mishigamaa, meaning "large water" or "large lake"....
and all but the eastern tip of the Upper Peninsula. Northwest Territory was left with only most of
OhioOhio is a Midwestern state in the United States. The 34th largest state by area in the U.S.,it is the 7th‑most populous with over 11.5 million residents, containing several major American cities and seven metropolitan areas with populations of 500,000 or more.The state's capital is Columbus...
and the rest of Michigan.
July 10, 1800
ConnecticutConnecticut is a state in the New England region of the northeastern United States. It is bordered by Rhode Island to the east, Massachusetts to the north, and the state of New York to the west and the south .Connecticut is named for the Connecticut River, the major U.S. river that approximately...
ceded its Western Reserve to the federal government, which made it part of
Northwest TerritoryThe Territory Northwest of the River Ohio, more commonly known as the Northwest Territory, was an organized incorporated territory of the United States that existed from July 13, 1787, until March 1, 1803, when the southeastern portion of the territory was admitted to the Union as the state of Ohio...
, and is the northeastern part of present-day
OhioOhio is a Midwestern state in the United States. The 34th largest state by area in the U.S.,it is the 7th‑most populous with over 11.5 million residents, containing several major American cities and seven metropolitan areas with populations of 500,000 or more.The state's capital is Columbus...
.
October 1, 1800
The secret
Third Treaty of San IldefonsoThe Third Treaty of San Ildefonso was a secretly negotiated treaty between France and Spain in which Spain returned the colonial territory of...
transferred the
colony of LouisianaLouisiana or French Louisiana was an administrative district of New France. Under French control from 1682–1763 and 1800–03, the area was named in honor of Louis XIV, by French explorer René-Robert Cavelier, Sieur de la Salle...
from
SpainThe Spanish Empire comprised territories and colonies administered directly by Spain in Europe, in America, Africa, Asia and Oceania. It originated during the Age of Exploration and was therefore one of the first global empires. At the time of Habsburgs, Spain reached the peak of its world power....
to
FranceThe French colonial empire was the set of territories outside Europe that were under French rule primarily from the 17th century to the late 1960s. In the 19th and 20th centuries, the colonial empire of France was the second-largest in the world behind the British Empire. The French colonial empire...
. Its boundaries were not specified and control was not actually transferred until the Louisiana Purchase.
April 26, 1802
GeorgiaGeorgia is a state located in the southeastern United States. It was established in 1732, the last of the original Thirteen Colonies. The state is named after King George II of Great Britain. Georgia was the fourth state to ratify the United States Constitution, on January 2, 1788...
finally ceded its western claims, the
Yazoo LandsThe Yazoo lands were the sparsely-populated central and western areas of the U.S. state of Georgia, when its western border stretched back to the Mississippi River. It was named for the Yazoo tribe of Native Americans. Several other places and things were named Yazoo, either for or along with the...
, to the federal government, where it became unorganized land.
March 1, 1803
The southeastern portion of
Northwest TerritoryThe Territory Northwest of the River Ohio, more commonly known as the Northwest Territory, was an organized incorporated territory of the United States that existed from July 13, 1787, until March 1, 1803, when the southeastern portion of the territory was admitted to the Union as the state of Ohio...
was admitted as the 17th state,
OhioOhio is a Midwestern state in the United States. The 34th largest state by area in the U.S.,it is the 7th‑most populous with over 11.5 million residents, containing several major American cities and seven metropolitan areas with populations of 500,000 or more.The state's capital is Columbus...
. The remainder of Northwest Territory was transferred to
Indiana TerritoryThe Territory of Indiana was an organized incorporated territory of the United States that existed from July 4, 1800, until November 7, 1816, when the southern portion of the territory was admitted to the Union as the state of Indiana....
.
April 30, 1803
The
Louisiana PurchaseThe Louisiana Purchase was the acquisition by the United States of America of of France's claim to the territory of Louisiana in 1803. The U.S...
was made, expanding the United States west of the
Mississippi RiverThe Mississippi River is the largest river system in North America. Flowing entirely in the United States, this river rises in western Minnesota and meanders slowly southwards for to the Mississippi River Delta at the Gulf of Mexico. With its many tributaries, the Mississippi's watershed drains...
. There was a
disputeThe West Florida Controversy was a series of border disputes between Spain and the United States over the region known as West Florida. The controversy commenced immediately after Spain received the colonies of West and East Florida from the Kingdom of Great Britain following the American...
with
West FloridaWest Florida was a region on the north shore of the Gulf of Mexico, which underwent several boundary and sovereignty changes during its history. West Florida was first established in 1763 by the British government; as its name suggests it largely consisted of the western portion of the region...
over how much land east of the
Mississippi RiverThe Mississippi River is the largest river system in North America. Flowing entirely in the United States, this river rises in western Minnesota and meanders slowly southwards for to the Mississippi River Delta at the Gulf of Mexico. With its many tributaries, the Mississippi's watershed drains...
it included. West of the Mississippi, it was defined as the Mississippi Basin, whose extent was not known at the time and extends slightly north of the modern Canada-US border. It consisted of the whole of present-day
ArkansasArkansas is a state located in the southern region of the United States. Its name is an Algonquian name of the Quapaw Indians. Arkansas shares borders with six states , and its eastern border is largely defined by the Mississippi River...
,
KansasKansas is a US state located in the Midwestern United States. It is named after the Kansas River which flows through it, which in turn was named after the Kansa Native American tribe, which inhabited the area. The tribe's name is often said to mean "people of the wind" or "people of the south...
,
IowaIowa is a state located in the Midwestern United States, an area often referred to as the "American Heartland". It derives its name from the Ioway people, one of the many American Indian tribes that occupied the state at the time of European exploration. Iowa was a part of the French colony of New...
,
MissouriMissouri is a US state located in the Midwestern United States, bordered by Iowa, Illinois, Kentucky, Tennessee, Arkansas, Oklahoma, Kansas and Nebraska. With a 2010 population of 5,988,927, Missouri is the 18th most populous state in the nation and the fifth most populous in the Midwest. It...
,
NebraskaNebraska is a state on the Great Plains of the Midwestern United States. The state's capital is Lincoln and its largest city is Omaha, on the Missouri River....
, and
OklahomaOklahoma is a state located in the South Central region of the United States of America. With an estimated 3,751,351 residents as of the 2010 census and a land area of 68,667 square miles , Oklahoma is the 28th most populous and 20th-largest state...
, and portions of
ColoradoColorado is a U.S. state that encompasses much of the Rocky Mountains as well as the northeastern portion of the Colorado Plateau and the western edge of the Great Plains...
,
LouisianaLouisiana is a state located in the southern region of the United States of America. Its capital is Baton Rouge and largest city is New Orleans. Louisiana is the only state in the U.S. with political subdivisions termed parishes, which are local governments equivalent to counties...
,
MinnesotaMinnesota is a U.S. state located in the Midwestern United States. The twelfth largest state of the U.S., it is the twenty-first most populous, with 5.3 million residents. Minnesota was carved out of the eastern half of the Minnesota Territory and admitted to the Union as the thirty-second state...
,
MontanaMontana is a state in the Western United States. The western third of Montana contains numerous mountain ranges. Smaller, "island ranges" are found in the central third of the state, for a total of 77 named ranges of the Rocky Mountains. This geographical fact is reflected in the state's name,...
,
New MexicoNew Mexico is a state located in the southwest and western regions of the United States. New Mexico is also usually considered one of the Mountain States. With a population density of 16 per square mile, New Mexico is the sixth-most sparsely inhabited U.S...
,
North DakotaNorth Dakota is a state located in the Midwestern region of the United States of America, along the Canadian border. The state is bordered by Canada to the north, Minnesota to the east, South Dakota to the south and Montana to the west. North Dakota is the 19th-largest state by area in the U.S....
,
South DakotaSouth Dakota is a state located in the Midwestern region of the United States. It is named after the Lakota and Dakota Sioux American Indian tribes. Once a part of Dakota Territory, South Dakota became a state on November 2, 1889. The state has an area of and an estimated population of just over...
,
TexasTexas is the second largest U.S. state by both area and population, and the largest state by area in the contiguous United States.The name, based on the Caddo word "Tejas" meaning "friends" or "allies", was applied by the Spanish to the Caddo themselves and to the region of their settlement in...
and
WyomingWyoming is a state in the mountain region of the Western United States. The western two thirds of the state is covered mostly with the mountain ranges and rangelands in the foothills of the Eastern Rocky Mountains, while the eastern third of the state is high elevation prairie known as the High...
. It also included the southernmost portions of the present-day
CanadianCanada is a North American country consisting of ten provinces and three territories. Located in the northern part of the continent, it extends from the Atlantic Ocean in the east to the Pacific Ocean in the west, and northward into the Arctic Ocean...
provinces of
AlbertaAlberta is a province of Canada. It had an estimated population of 3.7 million in 2010 making it the most populous of Canada's three prairie provinces...
,
ManitobaManitoba is a Canadian prairie province with an area of . The province has over 110,000 lakes and has a largely continental climate because of its flat topography. Agriculture, mostly concentrated in the fertile southern and western parts of the province, is vital to the province's economy; other...
, and
SaskatchewanSaskatchewan is a prairie province in Canada, which has an area of . Saskatchewan is bordered on the west by Alberta, on the north by the Northwest Territories, on the east by Manitoba, and on the south by the U.S. states of Montana and North Dakota....
.
March 27, 1804
The unorganized land ceded by
GeorgiaGeorgia is a state located in the southeastern United States. It was established in 1732, the last of the original Thirteen Colonies. The state is named after King George II of Great Britain. Georgia was the fourth state to ratify the United States Constitution, on January 2, 1788...
was added to
Mississippi TerritoryThe Territory of Mississippi was an organized incorporated territory of the United States that existed from April 7, 1798, until December 10, 1817, when the final extent of the territory was admitted to the Union as the state of Mississippi....
, consisting of the whole of present-day
MississippiMississippi is a U.S. state located in the Southern United States. Jackson is the state capital and largest city. The name of the state derives from the Mississippi River, which flows along its western boundary, whose name comes from the Ojibwe word misi-ziibi...
and
AlabamaAlabama is a state located in the southeastern region of the United States. It is bordered by Tennessee to the north, Georgia to the east, Florida and the Gulf of Mexico to the south, and Mississippi to the west. Alabama ranks 30th in total land area and ranks second in the size of its inland...
, minus their
panhandleA panhandle is an informal geographic term for an elongated arm-like protrusion of a geo-political entity, such as a subnational entity or a sovereign state.-Term:...
s which were still part of
West FloridaWest Florida was a region on the north shore of the Gulf of Mexico, which underwent several boundary and sovereignty changes during its history. West Florida was first established in 1763 by the British government; as its name suggests it largely consisted of the western portion of the region...
.
October 1, 1804
The
Louisiana PurchaseThe Louisiana Purchase was the acquisition by the United States of America of of France's claim to the territory of Louisiana in 1803. The U.S...
was split into the
District of LouisianaThe District of Louisiana, or Louisiana District, was an official, temporary, United States government designation for the portion of the Louisiana Purchase that had not been organized into the Orleans Territory. It officially existed from March 10, 1804 until July 4, 1805, when it was incorporated...
, which was temporarily under the authority of
Indiana TerritoryThe Territory of Indiana was an organized incorporated territory of the United States that existed from July 4, 1800, until November 7, 1816, when the southern portion of the territory was admitted to the Union as the state of Indiana....
, and the organized Territory of Orleans, which corresponded to part of present-day
LouisianaLouisiana is a state located in the southern region of the United States of America. Its capital is Baton Rouge and largest city is New Orleans. Louisiana is the only state in the U.S. with political subdivisions termed parishes, which are local governments equivalent to counties...
with a small portion of
TexasTexas is the second largest U.S. state by both area and population, and the largest state by area in the contiguous United States.The name, based on the Caddo word "Tejas" meaning "friends" or "allies", was applied by the Spanish to the Caddo themselves and to the region of their settlement in...
. The western border of Orleans Territory caused further conflict with
New SpainNew Spain, formally called the Viceroyalty of New Spain , was a viceroyalty of the Spanish colonial empire, comprising primarily territories in what was known then as 'América Septentrional' or North America. Its capital was Mexico City, formerly Tenochtitlan, capital of the Aztec Empire...
, specifically over the region between the Sabine River on the west and the
Arroyo Hondo (River)The Calcasieu River is a river on the Gulf Coast of southwestern Louisiana, U.S.A.. Approximately long, it drains a largely rural area of forests and bayou country, meandering southward to the Gulf of Mexico. The name "Calcasieu" comes from the Native American Atakapa language katkosh, for...
on the east, which became known as the
Sabine Free StateThe Neutral Ground was a disputed area between Spanish Texas and the United States' newly acquired Louisiana Purchase...
. This land was later confirmed as U.S. territory by the
Adams-Onís TreatyThe Adams–Onís Treaty of 1819, also known as the Transcontinental Treaty or the Purchase of Florida, was a treaty between the United States and Spain in 1819 that gave Florida to the U.S. and set out a boundary between the U.S. and New Spain . It settled a standing border dispute between the two...
of 1819.
January 11, 1805
Michigan TerritoryThe Territory of Michigan was an organized incorporated territory of the United States that existed from June 30, 1805, until January 26, 1837, when the final extent of the territory was admitted to the Union as the State of Michigan...
was split from
Indiana TerritoryThe Territory of Indiana was an organized incorporated territory of the United States that existed from July 4, 1800, until November 7, 1816, when the southern portion of the territory was admitted to the Union as the state of Indiana....
, including the whole of the lower peninsula of present-day
MichiganMichigan is a U.S. state located in the Great Lakes Region of the United States of America. The name Michigan is the French form of the Ojibwa word mishigamaa, meaning "large water" or "large lake"....
but only that eastern tip of the upper peninsula which was held by the
Northwest TerritoryThe Territory Northwest of the River Ohio, more commonly known as the Northwest Territory, was an organized incorporated territory of the United States that existed from July 13, 1787, until March 1, 1803, when the southeastern portion of the territory was admitted to the Union as the state of Ohio...
after Indiana Territory had been split from it.
July 4, 1805
The
District of LouisianaThe District of Louisiana, or Louisiana District, was an official, temporary, United States government designation for the portion of the Louisiana Purchase that had not been organized into the Orleans Territory. It officially existed from March 10, 1804 until July 4, 1805, when it was incorporated...
was organized as
Louisiana TerritoryThe Territory of Louisiana or Louisiana Territory was an organized incorporated territory of the United States that existed from July 4, 1805 until June 4, 1812, when it was renamed to Missouri Territory...
.
March 1, 1809
Illinois TerritoryThe Territory of Illinois was an organized incorporated territory of the United States that existed from March 1, 1809, until December 3, 1818, when the southern portion of the territory was admitted to the Union as the State of Illinois. The area was earlier known as "Illinois Country" while under...
was split from
Indiana TerritoryThe Territory of Indiana was an organized incorporated territory of the United States that existed from July 4, 1800, until November 7, 1816, when the southern portion of the territory was admitted to the Union as the state of Indiana....
. Illinois Territory included present-day
IllinoisIllinois is the fifth-most populous state of the United States of America, and is often noted for being a microcosm of the entire country. With Chicago in the northeast, small industrial cities and great agricultural productivity in central and northern Illinois, and natural resources like coal,...
, northeastern
MinnesotaMinnesota is a U.S. state located in the Midwestern United States. The twelfth largest state of the U.S., it is the twenty-first most populous, with 5.3 million residents. Minnesota was carved out of the eastern half of the Minnesota Territory and admitted to the Union as the thirty-second state...
, and
WisconsinWisconsin is a U.S. state located in the north-central United States and is part of the Midwest. It is bordered by Minnesota to the west, Iowa to the southwest, Illinois to the south, Lake Michigan to the east, Michigan to the northeast, and Lake Superior to the north. Wisconsin's capital is...
. Indiana Territory included the present-day borders of
IndianaIndiana is a US state, admitted to the United States as the 19th on December 11, 1816. It is located in the Midwestern United States and Great Lakes Region. With 6,483,802 residents, the state is ranked 15th in population and 16th in population density. Indiana is ranked 38th in land area and is...
, with its western and eastern borders continuing northward; thus, it also included the central portion of the upper peninsula of Michigan, as well as
Door PeninsulaThe Door Peninsula is a peninsula in eastern Wisconsin, separating the southern part of the Green Bay from Lake Michigan. The peninsula begins in northern Brown and Kewaunee counties and proceeds northeast to include all of Door County. It is the western portion of the Niagara Escarpment. Well...
of present-day
WisconsinWisconsin is a U.S. state located in the north-central United States and is part of the Midwest. It is bordered by Minnesota to the west, Iowa to the southwest, Illinois to the south, Lake Michigan to the east, Michigan to the northeast, and Lake Superior to the north. Wisconsin's capital is...
.
1810s
April 1810
The Hawaiian islands are unified as the
Kingdom of HawaiiThe Kingdom of Hawaii was established during the years 1795 to 1810 with the subjugation of the smaller independent chiefdoms of Oahu, Maui, Molokai, Lānai, Kauai and Niihau by the chiefdom of Hawaii into one unified government...
.
October 27, 1810
By proclamation by President
James MadisonJames Madison, Jr. was an American statesman and political theorist. He was the fourth President of the United States and is hailed as the “Father of the Constitution” for being the primary author of the United States Constitution and at first an opponent of, and then a key author of the United...
, the United States annexed the Baton Rouge and
Mobile DistrictThe Mobile District was an administrative region of the Spanish territory of West Florida, which became part of the independent Republic of West Florida on September 23, 1810. The region was bounded in the north by the 31st parallel, in the south by the Gulf of Mexico, in the east by the Perdido...
s of
West FloridaWest Florida was a region on the north shore of the Gulf of Mexico, which underwent several boundary and sovereignty changes during its history. West Florida was first established in 1763 by the British government; as its name suggests it largely consisted of the western portion of the region...
, declaring them part of the
Louisiana PurchaseThe Louisiana Purchase was the acquisition by the United States of America of of France's claim to the territory of Louisiana in 1803. The U.S...
. These had, 90 days earlier, declared independence as the Republic of West Florida.
April 30, 1812
Most of the Territory of Orleans was admitted as the 18th state,
LouisianaLouisiana is a state located in the southern region of the United States of America. Its capital is Baton Rouge and largest city is New Orleans. Louisiana is the only state in the U.S. with political subdivisions termed parishes, which are local governments equivalent to counties...
. The rest of the territory (the northwestern tip) was ceded to
Louisiana TerritoryThe Territory of Louisiana or Louisiana Territory was an organized incorporated territory of the United States that existed from July 4, 1805 until June 4, 1812, when it was renamed to Missouri Territory...
.
May 12, 1812
The federal government annexed a part of
West FloridaWest Florida was a region on the north shore of the Gulf of Mexico, which underwent several boundary and sovereignty changes during its history. West Florida was first established in 1763 by the British government; as its name suggests it largely consisted of the western portion of the region...
, the
Mobile DistrictThe Mobile District was an administrative region of the Spanish territory of West Florida, which became part of the independent Republic of West Florida on September 23, 1810. The region was bounded in the north by the 31st parallel, in the south by the Gulf of Mexico, in the east by the Perdido...
, to
Mississippi TerritoryThe Territory of Mississippi was an organized incorporated territory of the United States that existed from April 7, 1798, until December 10, 1817, when the final extent of the territory was admitted to the Union as the state of Mississippi....
, making the territory correspond to present-day
AlabamaAlabama is a state located in the southeastern region of the United States. It is bordered by Tennessee to the north, Georgia to the east, Florida and the Gulf of Mexico to the south, and Mississippi to the west. Alabama ranks 30th in total land area and ranks second in the size of its inland...
and
MississippiMississippi is a U.S. state located in the Southern United States. Jackson is the state capital and largest city. The name of the state derives from the Mississippi River, which flows along its western boundary, whose name comes from the Ojibwe word misi-ziibi...
.
June 4, 1812
Louisiana TerritoryThe Territory of Louisiana or Louisiana Territory was an organized incorporated territory of the United States that existed from July 4, 1805 until June 4, 1812, when it was renamed to Missouri Territory...
, having the same name as a state, was renamed to
Missouri TerritoryThe Territory of Missouri was an organized incorporated territory of the United States that existed from June 4, 1812 until August 10, 1821, when the southeastern portion of the territory was admitted to the Union as the State of Missouri.-History:...
.
April 17, 1813
Republican Army of the North captured
San Antonio, TexasSan Antonio is the seventh-largest city in the United States of America and the second-largest city within the state of Texas, with a population of 1.33 million. Located in the American Southwest and the south–central part of Texas, the city serves as the seat of Bexar County. In 2011,...
, assassinated the governor
Manuel María de SalcedoManuel María de Salcedo y Quiroga , Manuel María de Salcedo y Quiroga , Manuel María de Salcedo y Quiroga , (Malaga, Spain, (1776 - executed, 3 April 1813), was a governor of Spanish Texas from 1808 until his execution in 1813. Salcedo gained leadership experience helping his father Juan Manuel de...
, proclaimed Texas an independent nation, and issued Texas's first constitution on this date. Spanish forces recaptured the province later that year and executed any Tejanos accused of having Republican tendencies. By 1820 fewer than 2000 Hispanic citizens remained in
Spanish TexasSpanish Texas was one of the interior provinces of New Spain from 1690 until 1821. Although Spain claimed ownership of the territory, which comprised part of modern-day Texas, including the land north of the Medina and Nueces Rivers, the Spanish did not attempt to colonize the area until after...
.
December 11, 1816
The southern portion of
Indiana TerritoryThe Territory of Indiana was an organized incorporated territory of the United States that existed from July 4, 1800, until November 7, 1816, when the southern portion of the territory was admitted to the Union as the state of Indiana....
was admitted as the 19th state,
IndianaIndiana is a US state, admitted to the United States as the 19th on December 11, 1816. It is located in the Midwestern United States and Great Lakes Region. With 6,483,802 residents, the state is ranked 15th in population and 16th in population density. Indiana is ranked 38th in land area and is...
. The remainder became unorganized.
March 3, 1817
Alabama TerritoryThe Territory of Alabama was an organized incorporated territory of the United States that existed from August 15, 1817, until December 14, 1819, when it was admitted to the Union as the State of Alabama.-History:...
was split from
Mississippi TerritoryThe Territory of Mississippi was an organized incorporated territory of the United States that existed from April 7, 1798, until December 10, 1817, when the final extent of the territory was admitted to the Union as the state of Mississippi....
; both correspond to their present-day counterparts.
December 10, 1817
Mississippi TerritoryThe Territory of Mississippi was an organized incorporated territory of the United States that existed from April 7, 1798, until December 10, 1817, when the final extent of the territory was admitted to the Union as the state of Mississippi....
was admitted as the 20th state,
MississippiMississippi is a U.S. state located in the Southern United States. Jackson is the state capital and largest city. The name of the state derives from the Mississippi River, which flows along its western boundary, whose name comes from the Ojibwe word misi-ziibi...
.
October 20, 1818
The
Treaty of 1818The Convention respecting fisheries, boundary and the restoration of slaves between the United States of America and the United Kingdom of Great Britain and Ireland, also known as the London Convention, Anglo-American Convention of 1818, Convention of 1818, or simply the Treaty of 1818, was a...
established the
49th parallel northThe 49th parallel north is a circle of latitude that is 49 degrees north of the Earth's equatorial plane. It crosses Europe, Asia, the Pacific Ocean, North America, and the Atlantic Ocean....
west of the
Lake of the WoodsLake of the Woods is a lake occupying parts of the Canadian provinces of Ontario and Manitoba and the U.S. state of Minnesota. It separates a small land area of Minnesota from the rest of the United States. The Northwest Angle and the town of Angle Township can only be reached from the rest of...
as the border with British-held lands, and
Oregon CountryThe Oregon Country was a predominantly American term referring to a disputed ownership region of the Pacific Northwest of North America. The region was occupied by British and French Canadian fur traders from before 1810, and American settlers from the mid-1830s, with its coastal areas north from...
was established as a shared land between the United States and United Kingdom. Oregon Country consisted of most of present-day
IdahoIdaho is a state in the Rocky Mountain area of the United States. The state's largest city and capital is Boise. Residents are called "Idahoans". Idaho was admitted to the Union on July 3, 1890, as the 43rd state....
and
OregonOregon is a state in the Pacific Northwest region of the United States. It is located on the Pacific coast, with Washington to the north, California to the south, Nevada on the southeast and Idaho to the east. The Columbia and Snake rivers delineate much of Oregon's northern and eastern...
, all of Washington, and a portion of
MontanaMontana is a state in the Western United States. The western third of Montana contains numerous mountain ranges. Smaller, "island ranges" are found in the central third of the state, for a total of 77 named ranges of the Rocky Mountains. This geographical fact is reflected in the state's name,...
, as well as the southern part of the
CanadianCanada is a North American country consisting of ten provinces and three territories. Located in the northern part of the continent, it extends from the Atlantic Ocean in the east to the Pacific Ocean in the west, and northward into the Arctic Ocean...
province of
British ColumbiaBritish Columbia is the westernmost of Canada's provinces and is known for its natural beauty, as reflected in its Latin motto, Splendor sine occasu . Its name was chosen by Queen Victoria in 1858...
. The treaty transferred the Red River Basin to the United States, consisting of northwestern
MinnesotaMinnesota is a U.S. state located in the Midwestern United States. The twelfth largest state of the U.S., it is the twenty-first most populous, with 5.3 million residents. Minnesota was carved out of the eastern half of the Minnesota Territory and admitted to the Union as the thirty-second state...
, northeastern
North DakotaNorth Dakota is a state located in the Midwestern region of the United States of America, along the Canadian border. The state is bordered by Canada to the north, Minnesota to the east, South Dakota to the south and Montana to the west. North Dakota is the 19th-largest state by area in the U.S....
, and the northeastern tip of
South DakotaSouth Dakota is a state located in the Midwestern region of the United States. It is named after the Lakota and Dakota Sioux American Indian tribes. Once a part of Dakota Territory, South Dakota became a state on November 2, 1889. The state has an area of and an estimated population of just over...
.
December 3, 1818
The southern portion of
Illinois TerritoryThe Territory of Illinois was an organized incorporated territory of the United States that existed from March 1, 1809, until December 3, 1818, when the southern portion of the territory was admitted to the Union as the State of Illinois. The area was earlier known as "Illinois Country" while under...
was admitted as the 21st state,
IllinoisIllinois is the fifth-most populous state of the United States of America, and is often noted for being a microcosm of the entire country. With Chicago in the northeast, small industrial cities and great agricultural productivity in central and northern Illinois, and natural resources like coal,...
. The remainder was reassigned to
Michigan TerritoryThe Territory of Michigan was an organized incorporated territory of the United States that existed from June 30, 1805, until January 26, 1837, when the final extent of the territory was admitted to the Union as the State of Michigan...
. The unorganized lands which had been a part of
Indiana TerritoryThe Territory of Indiana was an organized incorporated territory of the United States that existed from July 4, 1800, until November 7, 1816, when the southern portion of the territory was admitted to the Union as the state of Indiana....
prior to the admission of
IndianaIndiana is a US state, admitted to the United States as the 19th on December 11, 1816. It is located in the Midwestern United States and Great Lakes Region. With 6,483,802 residents, the state is ranked 15th in population and 16th in population density. Indiana is ranked 38th in land area and is...
as a state were also assigned to Michigan Territory.
March 2, 1819
The southern part of
Missouri TerritoryThe Territory of Missouri was an organized incorporated territory of the United States that existed from June 4, 1812 until August 10, 1821, when the southeastern portion of the territory was admitted to the Union as the State of Missouri.-History:...
was organized as Arkansaw Territory, consisting of present-day
ArkansasArkansas is a state located in the southern region of the United States. Its name is an Algonquian name of the Quapaw Indians. Arkansas shares borders with six states , and its eastern border is largely defined by the Mississippi River...
as well as part of
OklahomaOklahoma is a state located in the South Central region of the United States of America. With an estimated 3,751,351 residents as of the 2010 census and a land area of 68,667 square miles , Oklahoma is the 28th most populous and 20th-largest state...
. It was not officially spelled Arkansas until later.
December 14, 1819
Alabama TerritoryThe Territory of Alabama was an organized incorporated territory of the United States that existed from August 15, 1817, until December 14, 1819, when it was admitted to the Union as the State of Alabama.-History:...
was admitted as the 22nd state,
AlabamaAlabama is a state located in the southeastern region of the United States. It is bordered by Tennessee to the north, Georgia to the east, Florida and the Gulf of Mexico to the south, and Mississippi to the west. Alabama ranks 30th in total land area and ranks second in the size of its inland...
.
1820s
March 16, 1820
The
Maine DistrictThe District of Maine was a legal designation for what is now the U.S. state of Maine from American independence until the Missouri Compromise on March 4, 1820, after which it gained its independence from Massachusetts and became the 23rd state in the Union...
of
MassachusettsThe Commonwealth of Massachusetts is a state in the New England region of the northeastern United States of America. It is bordered by Rhode Island and Connecticut to the south, New York to the west, and Vermont and New Hampshire to the north; at its east lies the Atlantic Ocean. As of the 2010...
was split off and admitted as the 23rd state,
MaineMaine is a state in the New England region of the northeastern United States, bordered by the Atlantic Ocean to the east and south, New Hampshire to the west, and the Canadian provinces of Quebec to the northwest and New Brunswick to the northeast. Maine is both the northernmost and easternmost...
, as part of the
Missouri CompromiseThe Missouri Compromise was an agreement passed in 1820 between the pro-slavery and anti-slavery factions in the United States Congress, involving primarily the regulation of slavery in the western territories. It prohibited slavery in the former Louisiana Territory north of the parallel 36°30'...
.
July 10, 1821
The
Adams-Onís TreatyThe Adams–Onís Treaty of 1819, also known as the Transcontinental Treaty or the Purchase of Florida, was a treaty between the United States and Spain in 1819 that gave Florida to the U.S. and set out a boundary between the U.S. and New Spain . It settled a standing border dispute between the two...
or Transcontinental Treaty came into effect, establishing a defined border between the United States and
New SpainNew Spain, formally called the Viceroyalty of New Spain , was a viceroyalty of the Spanish colonial empire, comprising primarily territories in what was known then as 'América Septentrional' or North America. Its capital was Mexico City, formerly Tenochtitlan, capital of the Aztec Empire...
. The treaty ceded Spain's claims to
Oregon CountryThe Oregon Country was a predominantly American term referring to a disputed ownership region of the Pacific Northwest of North America. The region was occupied by British and French Canadian fur traders from before 1810, and American settlers from the mid-1830s, with its coastal areas north from...
to the United States and American claims to Texas to Spain; moved portions of present-day
ColoradoColorado is a U.S. state that encompasses much of the Rocky Mountains as well as the northeastern portion of the Colorado Plateau and the western edge of the Great Plains...
,
OklahomaOklahoma is a state located in the South Central region of the United States of America. With an estimated 3,751,351 residents as of the 2010 census and a land area of 68,667 square miles , Oklahoma is the 28th most populous and 20th-largest state...
, and
WyomingWyoming is a state in the mountain region of the Western United States. The western two thirds of the state is covered mostly with the mountain ranges and rangelands in the foothills of the Eastern Rocky Mountains, while the eastern third of the state is high elevation prairie known as the High...
, and all of
New MexicoNew Mexico is a state located in the southwest and western regions of the United States. New Mexico is also usually considered one of the Mountain States. With a population density of 16 per square mile, New Mexico is the sixth-most sparsely inhabited U.S...
and
TexasTexas is the second largest U.S. state by both area and population, and the largest state by area in the contiguous United States.The name, based on the Caddo word "Tejas" meaning "friends" or "allies", was applied by the Spanish to the Caddo themselves and to the region of their settlement in...
, to New Spain; and all of
Spanish FloridaSpanish Florida refers to the Spanish territory of Florida, which formed part of the Captaincy General of Cuba, the Viceroyalty of New Spain, and the Spanish Empire. Originally extending over what is now the southeastern United States, but with no defined boundaries, la Florida was a component of...
to the United States. The new borders intruded on
Arkansaw Territory'sThe Territory of Arkansas, initially organized as the Territory of Arkansaw, was an organized incorporated territory of the United States that existed from July 4, 1819 until June 15, 1836, when the final extent of the territory was admitted to the Union as the State of Arkansas.-History:The...
Miller CountyOld Miller County was created April 1, 1820 by the Arkansas Territorial Legislature. It included much of what is southeastern Oklahoma and the northeastern counties in Texas .The Act delineated Miller County as follows:The 1820 territorial census listed 999 residents in Miller County, 82 of them...
, created on April 1, 1820, which dipped below the
Red RiverThe Red River, or sometimes the Red River of the South, is a major tributary of the Mississippi and Atchafalaya Rivers in the southern United States of America. The river gains its name from the red-bed country of its watershed. It is one of several rivers with that name...
and into land now ceded to Spain. However, the remoteness of the region caused no serious conflict with Spain.
August 10, 1821
The southeastern corner of
Missouri TerritoryThe Territory of Missouri was an organized incorporated territory of the United States that existed from June 4, 1812 until August 10, 1821, when the southeastern portion of the territory was admitted to the Union as the State of Missouri.-History:...
was admitted as the 24th state,
MissouriMissouri is a US state located in the Midwestern United States, bordered by Iowa, Illinois, Kentucky, Tennessee, Arkansas, Oklahoma, Kansas and Nebraska. With a 2010 population of 5,988,927, Missouri is the 18th most populous state in the nation and the fifth most populous in the Midwest. It...
. The remainder became unorganized. Missouri did not include its northwestern triangle at this point, that being added later in the
Platte PurchaseThe Platte Purchase was a land acquisition in 1836 by the United States government from Native American tribes all of which was east bank lands along the Missouri River that added to the northwest corner of the state of Missouri. The area acquired is almost as large as the states of Delaware and...
.
September 16, 1821
Ukase of 1821The Ukase of 1821 was a Russian proclamation of territorial sovereignty over Northwestern America, now present day Alaska. It declared that the Russian Empire prohibited "all foreign vessels not only to land on the coasts and islands belonging to Russia, [...] but also to approach them within less...
attempts to forbid non-Russian ships from approaching the Northwest Coast. Only attempt at enforcement is seizure of the U.S. brig
Pearl in 1822. U.S. reacts with the
Monroe DoctrineThe Monroe Doctrine is a policy of the United States introduced on December 2, 1823. It stated that further efforts by European nations to colonize land or interfere with states in North or South America would be viewed as acts of aggression requiring U.S. intervention...
in 1823.
September 27, 1821
The Viceroyalty of New Spain achieved independence as
MexicoThe United Mexican States , commonly known as Mexico , is a federal constitutional republic in North America. It is bordered on the north by the United States; on the south and west by the Pacific Ocean; on the southeast by Guatemala, Belize, and the Caribbean Sea; and on the east by the Gulf of...
.
Spanish TexasSpanish Texas was one of the interior provinces of New Spain from 1690 until 1821. Although Spain claimed ownership of the territory, which comprised part of modern-day Texas, including the land north of the Medina and Nueces Rivers, the Spanish did not attempt to colonize the area until after...
became
Mexican TexasMexican Texas is the name given by Texas history scholars to the period between 1821 and 1836, when Texas was an integral part of Mexico. The period began with Mexico's victory over Spain in its war of independence in 1821. For the first several years of its existence, Mexican Texas operated very...
.
March 30, 1822
East FloridaEast Florida was a colony of Great Britain from 1763–1783 and of Spain from 1783–1822. East Florida was established by the British colonial government in 1763; as its name implies it consisted of the eastern part of the region of Florida, with West Florida comprising the western parts. Its capital...
and the portion of
West FloridaWest Florida was a region on the north shore of the Gulf of Mexico, which underwent several boundary and sovereignty changes during its history. West Florida was first established in 1763 by the British government; as its name suggests it largely consisted of the western portion of the region...
not already part of other states were combined and organized as
Florida TerritoryThe Territory of Florida was an organized incorporated territory of the United States that existed from March 30, 1822, until March 3, 1845, when it was admitted to the Union as the State of Florida...
, which corresponded to present-day
FloridaFlorida is a state in the southeastern United States, located on the nation's Atlantic and Gulf coasts. It is bordered to the west by the Gulf of Mexico, to the north by Alabama and Georgia and to the east by the Atlantic Ocean. With a population of 18,801,310 as measured by the 2010 census, it...
. Around this time, the official spelling of Arkansaw Territory became
Arkansas TerritoryThe Territory of Arkansas, initially organized as the Territory of Arkansaw, was an organized incorporated territory of the United States that existed from July 4, 1819 until June 15, 1836, when the final extent of the territory was admitted to the Union as the State of Arkansas.-History:The...
.
November 15, 1824
Arkansas TerritoryThe Territory of Arkansas, initially organized as the Territory of Arkansaw, was an organized incorporated territory of the United States that existed from July 4, 1819 until June 15, 1836, when the final extent of the territory was admitted to the Union as the State of Arkansas.-History:The...
was shrunk, the western portion becoming unorganized.
January 12, 1825
Russo-American Treaty of 1824 gave
RussiaRussia or , officially known as both Russia and the Russian Federation , is a country in northern Eurasia. It is a federal semi-presidential republic, comprising 83 federal subjects...
n claims south of parallel 54°40′ north to the United States. This and the Anglo-Russian Convention of 1825 leave Britain and the U.S. as the only claimants to
Oregon CountryThe Oregon Country was a predominantly American term referring to a disputed ownership region of the Pacific Northwest of North America. The region was occupied by British and French Canadian fur traders from before 1810, and American settlers from the mid-1830s, with its coastal areas north from...
. Russia retained Fort Ross, California until 1841.
May 6, 1828
Arkansas TerritoryThe Territory of Arkansas, initially organized as the Territory of Arkansaw, was an organized incorporated territory of the United States that existed from July 4, 1819 until June 15, 1836, when the final extent of the territory was admitted to the Union as the State of Arkansas.-History:The...
was shrunk further, attaining the present-day borders of
ArkansasArkansas is a state located in the southern region of the United States. Its name is an Algonquian name of the Quapaw Indians. Arkansas shares borders with six states , and its eastern border is largely defined by the Mississippi River...
, with the remainder again becoming unorganized, excepting the land it still claimed as
Miller CountyOld Miller County was created April 1, 1820 by the Arkansas Territorial Legislature. It included much of what is southeastern Oklahoma and the northeastern counties in Texas .The Act delineated Miller County as follows:The 1820 territorial census listed 999 residents in Miller County, 82 of them...
.
1830s
June 30, 1834
A large portion of unorganized land was added to
Michigan TerritoryThe Territory of Michigan was an organized incorporated territory of the United States that existed from June 30, 1805, until January 26, 1837, when the final extent of the territory was admitted to the Union as the State of Michigan...
, corresponding to present-day
IowaIowa is a state located in the Midwestern United States, an area often referred to as the "American Heartland". It derives its name from the Ioway people, one of the many American Indian tribes that occupied the state at the time of European exploration. Iowa was a part of the French colony of New...
, western
MinnesotaMinnesota is a U.S. state located in the Midwestern United States. The twelfth largest state of the U.S., it is the twenty-first most populous, with 5.3 million residents. Minnesota was carved out of the eastern half of the Minnesota Territory and admitted to the Union as the thirty-second state...
, and eastern
North DakotaNorth Dakota is a state located in the Midwestern region of the United States of America, along the Canadian border. The state is bordered by Canada to the north, Minnesota to the east, South Dakota to the south and Montana to the west. North Dakota is the 19th-largest state by area in the U.S....
and
South DakotaSouth Dakota is a state located in the Midwestern region of the United States. It is named after the Lakota and Dakota Sioux American Indian tribes. Once a part of Dakota Territory, South Dakota became a state on November 2, 1889. The state has an area of and an estimated population of just over...
.
March 2, 1836
The
Republic of TexasThe Republic of Texas was an independent nation in North America, bordering the United States and Mexico, that existed from 1836 to 1846.Formed as a break-away republic from Mexico by the Texas Revolution, the state claimed borders that encompassed an area that included all of the present U.S...
achieved independence from
MexicoThe United Mexican States , commonly known as Mexico , is a federal constitutional republic in North America. It is bordered on the north by the United States; on the south and west by the Pacific Ocean; on the southeast by Guatemala, Belize, and the Caribbean Sea; and on the east by the Gulf of...
, though with a large portion of the territory disputed. It had control over the eastern half of present-day
TexasTexas is the second largest U.S. state by both area and population, and the largest state by area in the contiguous United States.The name, based on the Caddo word "Tejas" meaning "friends" or "allies", was applied by the Spanish to the Caddo themselves and to the region of their settlement in...
, and disputed the western half, as well as portions of
ColoradoColorado is a U.S. state that encompasses much of the Rocky Mountains as well as the northeastern portion of the Colorado Plateau and the western edge of the Great Plains...
,
KansasKansas is a US state located in the Midwestern United States. It is named after the Kansas River which flows through it, which in turn was named after the Kansa Native American tribe, which inhabited the area. The tribe's name is often said to mean "people of the wind" or "people of the south...
,
New MexicoNew Mexico is a state located in the southwest and western regions of the United States. New Mexico is also usually considered one of the Mountain States. With a population density of 16 per square mile, New Mexico is the sixth-most sparsely inhabited U.S...
, and
WyomingWyoming is a state in the mountain region of the Western United States. The western two thirds of the state is covered mostly with the mountain ranges and rangelands in the foothills of the Eastern Rocky Mountains, while the eastern third of the state is high elevation prairie known as the High...
.
Miller CountyOld Miller County was created April 1, 1820 by the Arkansas Territorial Legislature. It included much of what is southeastern Oklahoma and the northeastern counties in Texas .The Act delineated Miller County as follows:The 1820 territorial census listed 999 residents in Miller County, 82 of them...
in
Arkansas TerritoryThe Territory of Arkansas, initially organized as the Territory of Arkansaw, was an organized incorporated territory of the United States that existed from July 4, 1819 until June 15, 1836, when the final extent of the territory was admitted to the Union as the State of Arkansas.-History:The...
now intruded on the borders of Texas, and the people there began to take a Texian identity, leading to both governments having representatives from the county.
June 15, 1836
Arkansas TerritoryThe Territory of Arkansas, initially organized as the Territory of Arkansaw, was an organized incorporated territory of the United States that existed from July 4, 1819 until June 15, 1836, when the final extent of the territory was admitted to the Union as the State of Arkansas.-History:The...
was admitted as the 25th state,
ArkansasArkansas is a state located in the southern region of the United States. Its name is an Algonquian name of the Quapaw Indians. Arkansas shares borders with six states , and its eastern border is largely defined by the Mississippi River...
. It continued to claim
Miller CountyOld Miller County was created April 1, 1820 by the Arkansas Territorial Legislature. It included much of what is southeastern Oklahoma and the northeastern counties in Texas .The Act delineated Miller County as follows:The 1820 territorial census listed 999 residents in Miller County, 82 of them...
, with increasing irrelevance.
July 4, 1836
Wisconsin TerritoryThe Territory of Wisconsin was an organized incorporated territory of the United States that existed from July 3, 1836, until May 29, 1848, when an eastern portion of the territory was admitted to the Union as the State of Wisconsin...
was split off from
Michigan TerritoryThe Territory of Michigan was an organized incorporated territory of the United States that existed from June 30, 1805, until January 26, 1837, when the final extent of the territory was admitted to the Union as the State of Michigan...
, consisting of present-day
WisconsinWisconsin is a U.S. state located in the north-central United States and is part of the Midwest. It is bordered by Minnesota to the west, Iowa to the southwest, Illinois to the south, Lake Michigan to the east, Michigan to the northeast, and Lake Superior to the north. Wisconsin's capital is...
,
MinnesotaMinnesota is a U.S. state located in the Midwestern United States. The twelfth largest state of the U.S., it is the twenty-first most populous, with 5.3 million residents. Minnesota was carved out of the eastern half of the Minnesota Territory and admitted to the Union as the thirty-second state...
,
IowaIowa is a state located in the Midwestern United States, an area often referred to as the "American Heartland". It derives its name from the Ioway people, one of the many American Indian tribes that occupied the state at the time of European exploration. Iowa was a part of the French colony of New...
, and eastern
NorthNorth Dakota is a state located in the Midwestern region of the United States of America, along the Canadian border. The state is bordered by Canada to the north, Minnesota to the east, South Dakota to the south and Montana to the west. North Dakota is the 19th-largest state by area in the U.S....
and
South DakotaSouth Dakota is a state located in the Midwestern region of the United States. It is named after the Lakota and Dakota Sioux American Indian tribes. Once a part of Dakota Territory, South Dakota became a state on November 2, 1889. The state has an area of and an estimated population of just over...
. As an inducement to give up its claim over the Toledo Strip to
OhioOhio is a Midwestern state in the United States. The 34th largest state by area in the U.S.,it is the 7th‑most populous with over 11.5 million residents, containing several major American cities and seven metropolitan areas with populations of 500,000 or more.The state's capital is Columbus...
, the whole of the present-day
upper peninsulaThe Upper Peninsula of Michigan is the northern of the two major land masses that make up the U.S. state of Michigan. It is commonly referred to as the Upper Peninsula, the U.P., or Upper Michigan. It is also known as the land "above the Bridge" linking the two peninsulas. The peninsula is bounded...
was assigned to Michigan Territory, giving it the present-day borders of
MichiganMichigan is a U.S. state located in the Great Lakes Region of the United States of America. The name Michigan is the French form of the Ojibwa word mishigamaa, meaning "large water" or "large lake"....
.
January 26, 1837
Michigan TerritoryThe Territory of Michigan was an organized incorporated territory of the United States that existed from June 30, 1805, until January 26, 1837, when the final extent of the territory was admitted to the Union as the State of Michigan...
was admitted as the 26th state,
MichiganMichigan is a U.S. state located in the Great Lakes Region of the United States of America. The name Michigan is the French form of the Ojibwa word mishigamaa, meaning "large water" or "large lake"....
.
March 28, 1837
The
Platte PurchaseThe Platte Purchase was a land acquisition in 1836 by the United States government from Native American tribes all of which was east bank lands along the Missouri River that added to the northwest corner of the state of Missouri. The area acquired is almost as large as the states of Delaware and...
added a small area of land to
MissouriMissouri is a US state located in the Midwestern United States, bordered by Iowa, Illinois, Kentucky, Tennessee, Arkansas, Oklahoma, Kansas and Nebraska. With a 2010 population of 5,988,927, Missouri is the 18th most populous state in the nation and the fifth most populous in the Midwest. It...
, giving it its present-day boundaries.
July 4, 1838
Iowa TerritoryThe Territory of Iowa was an organized incorporated territory of the United States that existed from July 4, 1838, until December 28, 1846, when the southeastern portion of the territory was admitted to the Union as the State of Iowa.-History:...
was split off from
Wisconsin TerritoryThe Territory of Wisconsin was an organized incorporated territory of the United States that existed from July 3, 1836, until May 29, 1848, when an eastern portion of the territory was admitted to the Union as the State of Wisconsin...
, consisting of present-day
IowaIowa is a state located in the Midwestern United States, an area often referred to as the "American Heartland". It derives its name from the Ioway people, one of the many American Indian tribes that occupied the state at the time of European exploration. Iowa was a part of the French colony of New...
, western
MinnesotaMinnesota is a U.S. state located in the Midwestern United States. The twelfth largest state of the U.S., it is the twenty-first most populous, with 5.3 million residents. Minnesota was carved out of the eastern half of the Minnesota Territory and admitted to the Union as the thirty-second state...
, and eastern
North DakotaNorth Dakota is a state located in the Midwestern region of the United States of America, along the Canadian border. The state is bordered by Canada to the north, Minnesota to the east, South Dakota to the south and Montana to the west. North Dakota is the 19th-largest state by area in the U.S....
and
South DakotaSouth Dakota is a state located in the Midwestern region of the United States. It is named after the Lakota and Dakota Sioux American Indian tribes. Once a part of Dakota Territory, South Dakota became a state on November 2, 1889. The state has an area of and an estimated population of just over...
, leaving Wisconsin Territory with northeastern Minnesota and
WisconsinWisconsin is a U.S. state located in the north-central United States and is part of the Midwest. It is bordered by Minnesota to the west, Iowa to the southwest, Illinois to the south, Lake Michigan to the east, Michigan to the northeast, and Lake Superior to the north. Wisconsin's capital is...
.
1840s
November 10, 1842
The
Webster-Ashburton TreatyThe Webster–Ashburton Treaty, signed August 9, 1842, was a treaty resolving several border issues between the United States and the British North American colonies...
settled the border between the United States and lands held by the United Kingdom east of the
Rocky MountainsThe Rocky Mountains are a major mountain range in western North America. The Rocky Mountains stretch more than from the northernmost part of British Columbia, in western Canada, to New Mexico, in the southwestern United States...
, ending the disputes over the northern border of the state of
MaineMaine is a state in the New England region of the northeastern United States, bordered by the Atlantic Ocean to the east and south, New Hampshire to the west, and the Canadian provinces of Quebec to the northwest and New Brunswick to the northeast. Maine is both the northernmost and easternmost...
and northeastern border of
Wisconsin TerritoryThe Territory of Wisconsin was an organized incorporated territory of the United States that existed from July 3, 1836, until May 29, 1848, when an eastern portion of the territory was admitted to the Union as the State of Wisconsin...
, which today resides in present day
MinnesotaMinnesota is a U.S. state located in the Midwestern United States. The twelfth largest state of the U.S., it is the twenty-first most populous, with 5.3 million residents. Minnesota was carved out of the eastern half of the Minnesota Territory and admitted to the Union as the thirty-second state...
.
March 3, 1845
Florida TerritoryThe Territory of Florida was an organized incorporated territory of the United States that existed from March 30, 1822, until March 3, 1845, when it was admitted to the Union as the State of Florida...
was admitted as the 27th state,
FloridaFlorida is a state in the southeastern United States, located on the nation's Atlantic and Gulf coasts. It is bordered to the west by the Gulf of Mexico, to the north by Alabama and Georgia and to the east by the Atlantic Ocean. With a population of 18,801,310 as measured by the 2010 census, it...
.
December 29, 1845
The
Republic of TexasThe Republic of Texas was an independent nation in North America, bordering the United States and Mexico, that existed from 1836 to 1846.Formed as a break-away republic from Mexico by the Texas Revolution, the state claimed borders that encompassed an area that included all of the present U.S...
was admitted as the 28th state,
TexasTexas is the second largest U.S. state by both area and population, and the largest state by area in the contiguous United States.The name, based on the Caddo word "Tejas" meaning "friends" or "allies", was applied by the Spanish to the Caddo themselves and to the region of their settlement in...
. The
United States CongressThe United States Congress is the bicameral legislature of the federal government of the United States, consisting of the Senate and the House of Representatives. The Congress meets in the United States Capitol in Washington, D.C....
passed the
joint resolution of annexationIn 1845, United States of America annexed the Republic of Texas and admitted it to the Union as the 28th state. The U.S. thus inherited Texas's border dispute with Mexico; this quickly led to the Mexican-American War, during which the U.S. captured additional territory , extending the nation's...
on March 1, 1845, but Texas did not agree to join the union for some time after. Although the annexation resolution avoided specifying Texas's boundaries, the U.S. inherited Texas's unenforced claims to
South TexasSouth Texas is a region of the U.S. state of Texas that lies roughly south of and including San Antonio. The southern and western boundary is the Rio Grande River, and to the east it is the Gulf of Mexico. The population of this region is about 3.7 million. The southern portion of this region is...
,
West TexasWest Texas is a vernacular term applied to a region in the southwestern quadrant of the United States that primarily encompasses the arid and semi-arid lands in the western portion of the state of Texas....
, over half of
New MexicoNew Mexico is a state located in the southwest and western regions of the United States. New Mexico is also usually considered one of the Mountain States. With a population density of 16 per square mile, New Mexico is the sixth-most sparsely inhabited U.S...
, a third of
ColoradoColorado is a U.S. state that encompasses much of the Rocky Mountains as well as the northeastern portion of the Colorado Plateau and the western edge of the Great Plains...
, and small parts of
OklahomaOklahoma is a state located in the South Central region of the United States of America. With an estimated 3,751,351 residents as of the 2010 census and a land area of 68,667 square miles , Oklahoma is the 28th most populous and 20th-largest state...
,
KansasKansas is a US state located in the Midwestern United States. It is named after the Kansas River which flows through it, which in turn was named after the Kansa Native American tribe, which inhabited the area. The tribe's name is often said to mean "people of the wind" or "people of the south...
and
WyomingWyoming is a state in the mountain region of the Western United States. The western two thirds of the state is covered mostly with the mountain ranges and rangelands in the foothills of the Eastern Rocky Mountains, while the eastern third of the state is high elevation prairie known as the High...
. With Texas joining the union,
ArkansasArkansas is a state located in the southern region of the United States. Its name is an Algonquian name of the Quapaw Indians. Arkansas shares borders with six states , and its eastern border is largely defined by the Mississippi River...
finally gave up its claim on
Miller CountyOld Miller County was created April 1, 1820 by the Arkansas Territorial Legislature. It included much of what is southeastern Oklahoma and the northeastern counties in Texas .The Act delineated Miller County as follows:The 1820 territorial census listed 999 residents in Miller County, 82 of them...
.
June 18, 1846
The
Oregon TreatyThe Oregon Treaty is a treaty between the United Kingdom and the United States that was signed on June 15, 1846, in Washington, D.C. The treaty brought an end to the Oregon boundary dispute by settling competing American and British claims to the Oregon Country, which had been jointly occupied by...
established the
49th parallelThe 49th parallel north is a circle of latitude that is 49 degrees north of the Earth's equatorial plane. It crosses Europe, Asia, the Pacific Ocean, North America, and the Atlantic Ocean....
west of the Lake of the Woods as the continental border (so it did not include
Vancouver IslandVancouver Island is a large island in British Columbia, Canada. It is one of several North American locations named after George Vancouver, the British Royal Navy officer who explored the Pacific Northwest coast of North America between 1791 and 1794...
) with the lands held by the United Kingdom. The sharing of
Oregon CountryThe Oregon Country was a predominantly American term referring to a disputed ownership region of the Pacific Northwest of North America. The region was occupied by British and French Canadian fur traders from before 1810, and American settlers from the mid-1830s, with its coastal areas north from...
ended, and the American portion becomes unorganized territory.
August 15, 1846
U.S.
Army of the West (1846)The Army of the West was the name of the United States force commanded by Stephen W. Kearny during the Mexican-American War, which played a prominent role in the conquest of New Mexico and California....
under Stephen Kearny captures New Mexico and claims it for the U.S.
He installs a U.S. military government of New Mexico under the
Kearny CodeThe Kearny Code is a legal code named after General Stephen W. Kearny. The Kearny Code was promulgated in Santa Fe, New Mexico on 22 September 1846 for use in the New Mexico Territory, as occupied by the United States Army during the U.S.-Mexican War. Four days later General Kearny left for Alta...
and later a provisional government of New Mexico, subject to the federal government and not to Texas.
December 28, 1846
The southeast portion of
Iowa TerritoryThe Territory of Iowa was an organized incorporated territory of the United States that existed from July 4, 1838, until December 28, 1846, when the southeastern portion of the territory was admitted to the Union as the State of Iowa.-History:...
was admitted as the 29th state,
IowaIowa is a state located in the Midwestern United States, an area often referred to as the "American Heartland". It derives its name from the Ioway people, one of the many American Indian tribes that occupied the state at the time of European exploration. Iowa was a part of the French colony of New...
. The remainder became unorganized.
January 13, 1847
CalifornioCalifornio is a term used to identify a Spanish-speaking Catholic people, regardless of race, born in California before 1848...
resistance to U.S. forces in
CaliforniaCalifornia is a state located on the West Coast of the United States. It is by far the most populous U.S. state, and the third-largest by land area...
ended with the
Treaty of CahuengaThe Treaty of Cahuenga, also called the "Capitulation of Cahuenga," ended the fighting of the Mexican-American War in Alta California in 1847. It was not a formal treaty between nations but an informal agreement between rival military forces in which the Californios gave up fighting...
.
March 13, 1847
The District of Columbia
retrocededDistrict of Columbia retrocession is the process of returning the land that was given to the federal government for the original purpose of creating the national capital. The District of Columbia was formed in 1791 from of land ceded by the states of Maryland and Virginia in accordance with the...
its land south of the
Potomac RiverThe Potomac River flows into the Chesapeake Bay, located along the mid-Atlantic coast of the United States. The river is approximately long, with a drainage area of about 14,700 square miles...
back to
VirginiaThe Commonwealth of Virginia , is a U.S. state on the Atlantic Coast of the Southern United States. Virginia is nicknamed the "Old Dominion" and sometimes the "Mother of Presidents" after the eight U.S. presidents born there...
. Congress passed the retrocession act on July 9, 1846, and Virginia took possession of the land on this date.
February 2, 1848
The
Treaty of Guadalupe HidalgoThe Treaty of Guadalupe Hidalgo is the peace treaty, largely dictated by the United States to the interim government of a militarily occupied Mexico City, that ended the Mexican-American War on February 2, 1848...
ended the Mexican-American War. Mexico ceded the Texas-claimed areas as well as a
large area of landThe Mexican Cession of 1848 is a historical name in the United States for the region of the present day southwestern United States that Mexico ceded to the U.S...
consisting of all of present-day
CaliforniaCalifornia is a state located on the West Coast of the United States. It is by far the most populous U.S. state, and the third-largest by land area...
,
NevadaNevada is a state in the western, mountain west, and southwestern regions of the United States. With an area of and a population of about 2.7 million, it is the 7th-largest and 35th-most populous state. Over two-thirds of Nevada's people live in the Las Vegas metropolitan area, which contains its...
, and
UtahUtah is a state in the Western United States. It was the 45th state to join the Union, on January 4, 1896. Approximately 80% of Utah's 2,763,885 people live along the Wasatch Front, centering on Salt Lake City. This leaves vast expanses of the state nearly uninhabited, making the population the...
, most of
ArizonaArizona ; is a state located in the southwestern region of the United States. It is also part of the western United States and the mountain west. The capital and largest city is Phoenix...
, and portions of
ColoradoColorado is a U.S. state that encompasses much of the Rocky Mountains as well as the northeastern portion of the Colorado Plateau and the western edge of the Great Plains...
,
New MexicoNew Mexico is a state located in the southwest and western regions of the United States. New Mexico is also usually considered one of the Mountain States. With a population density of 16 per square mile, New Mexico is the sixth-most sparsely inhabited U.S...
, and
WyomingWyoming is a state in the mountain region of the Western United States. The western two thirds of the state is covered mostly with the mountain ranges and rangelands in the foothills of the Eastern Rocky Mountains, while the eastern third of the state is high elevation prairie known as the High...
.
May 29, 1848
The southeastern portion of
Wisconsin TerritoryThe Territory of Wisconsin was an organized incorporated territory of the United States that existed from July 3, 1836, until May 29, 1848, when an eastern portion of the territory was admitted to the Union as the State of Wisconsin...
was admitted as the 30th state,
WisconsinWisconsin is a U.S. state located in the north-central United States and is part of the Midwest. It is bordered by Minnesota to the west, Iowa to the southwest, Illinois to the south, Lake Michigan to the east, Michigan to the northeast, and Lake Superior to the north. Wisconsin's capital is...
. The remainder became unorganized.
August 14, 1848
Oregon TerritoryThe Territory of Oregon was an organized incorporated territory of the United States that existed from August 14, 1848, until February 14, 1859, when the southwestern portion of the territory was admitted to the Union as the State of Oregon. Originally claimed by several countries , the region was...
was organized, including present-day
IdahoIdaho is a state in the Rocky Mountain area of the United States. The state's largest city and capital is Boise. Residents are called "Idahoans". Idaho was admitted to the Union on July 3, 1890, as the 43rd state....
, northwestern
MontanaMontana is a state in the Western United States. The western third of Montana contains numerous mountain ranges. Smaller, "island ranges" are found in the central third of the state, for a total of 77 named ranges of the Rocky Mountains. This geographical fact is reflected in the state's name,...
,
OregonOregon is a state in the Pacific Northwest region of the United States. It is located on the Pacific coast, with Washington to the north, California to the south, Nevada on the southeast and Idaho to the east. The Columbia and Snake rivers delineate much of Oregon's northern and eastern...
, Washington, and western
WyomingWyoming is a state in the mountain region of the Western United States. The western two thirds of the state is covered mostly with the mountain ranges and rangelands in the foothills of the Eastern Rocky Mountains, while the eastern third of the state is high elevation prairie known as the High...
.
March 3, 1849
Minnesota TerritoryThe Territory of Minnesota was an organized incorporated territory of the United States that existed from March 3, 1849, until May 11, 1858, when the eastern portion of the territory was admitted to the Union as the State of Minnesota.-History:...
was organized, consisting of present-day
MinnesotaMinnesota is a U.S. state located in the Midwestern United States. The twelfth largest state of the U.S., it is the twenty-first most populous, with 5.3 million residents. Minnesota was carved out of the eastern half of the Minnesota Territory and admitted to the Union as the thirty-second state...
, and eastern portions of
North DakotaNorth Dakota is a state located in the Midwestern region of the United States of America, along the Canadian border. The state is bordered by Canada to the north, Minnesota to the east, South Dakota to the south and Montana to the west. North Dakota is the 19th-largest state by area in the U.S....
and
South DakotaSouth Dakota is a state located in the Midwestern region of the United States. It is named after the Lakota and Dakota Sioux American Indian tribes. Once a part of Dakota Territory, South Dakota became a state on November 2, 1889. The state has an area of and an estimated population of just over...
.
1850s
September 9, 1850
The
Compromise of 1850The Compromise of 1850 was a package of five bills, passed in September 1850, which defused a four-year confrontation between the slave states of the South and the free states of the North regarding the status of territories acquired during the Mexican-American War...
divided the
Mexican CessionThe Mexican Cession of 1848 is a historical name in the United States for the region of the present day southwestern United States that Mexico ceded to the U.S...
and land claimed by
TexasTexas is the second largest U.S. state by both area and population, and the largest state by area in the contiguous United States.The name, based on the Caddo word "Tejas" meaning "friends" or "allies", was applied by the Spanish to the Caddo themselves and to the region of their settlement in...
but ceded to the federal government in exchange for taking on its debts. The western portion was admitted as the 31st state,
CaliforniaCalifornia is a state located on the West Coast of the United States. It is by far the most populous U.S. state, and the third-largest by land area...
, most of the rest was organized as
Utah TerritoryThe Territory of Utah was an organized incorporated territory of the United States that existed from September 9, 1850, until January 4, 1896, when the final extent of the territory was admitted to the Union as the State of Utah....
and
New Mexico Territorythumb|right|240px|Proposed boundaries for State of New Mexico, 1850The Territory of New Mexico was an organized incorporated territory of the United States that existed from September 9, 1850, until January 6, 1912, when the final extent of the territory was admitted to the Union as the State of...
, and a small portion became unorganized land. New Mexico Territory consisted of most of present-day
ArizonaArizona ; is a state located in the southwestern region of the United States. It is also part of the western United States and the mountain west. The capital and largest city is Phoenix...
and
New MexicoNew Mexico is a state located in the southwest and western regions of the United States. New Mexico is also usually considered one of the Mountain States. With a population density of 16 per square mile, New Mexico is the sixth-most sparsely inhabited U.S...
, as well as a southern portion of
ColoradoColorado is a U.S. state that encompasses much of the Rocky Mountains as well as the northeastern portion of the Colorado Plateau and the western edge of the Great Plains...
and the southern tip of
NevadaNevada is a state in the western, mountain west, and southwestern regions of the United States. With an area of and a population of about 2.7 million, it is the 7th-largest and 35th-most populous state. Over two-thirds of Nevada's people live in the Las Vegas metropolitan area, which contains its...
. Utah Territory consisted of present-day
UtahUtah is a state in the Western United States. It was the 45th state to join the Union, on January 4, 1896. Approximately 80% of Utah's 2,763,885 people live along the Wasatch Front, centering on Salt Lake City. This leaves vast expanses of the state nearly uninhabited, making the population the...
, most of Nevada, and portions of Colorado and
WyomingWyoming is a state in the mountain region of the Western United States. The western two thirds of the state is covered mostly with the mountain ranges and rangelands in the foothills of the Eastern Rocky Mountains, while the eastern third of the state is high elevation prairie known as the High...
. A peculiarity appeared at this time, when a small strip of land north of Texas was not officially assigned by any state or territory; this came to be called the Neutral Strip or "No Man's Land", which corresponds to the present-day
panhandleA panhandle is an informal geographic term for an elongated arm-like protrusion of a geo-political entity, such as a subnational entity or a sovereign state.-Term:...
of
OklahomaOklahoma is a state located in the South Central region of the United States of America. With an estimated 3,751,351 residents as of the 2010 census and a land area of 68,667 square miles , Oklahoma is the 28th most populous and 20th-largest state...
.
March 2, 1853
Washington TerritoryThe Territory of Washington was an organized incorporated territory of the United States that existed from February 8, 1853, until November 11, 1889, when the final extent of the territory was admitted to the Union as the State of Washington....
was split from
Oregon TerritoryThe Territory of Oregon was an organized incorporated territory of the United States that existed from August 14, 1848, until February 14, 1859, when the southwestern portion of the territory was admitted to the Union as the State of Oregon. Originally claimed by several countries , the region was...
, consisting of present-day Washington, northern
IdahoIdaho is a state in the Rocky Mountain area of the United States. The state's largest city and capital is Boise. Residents are called "Idahoans". Idaho was admitted to the Union on July 3, 1890, as the 43rd state....
, and the western tip of
MontanaMontana is a state in the Western United States. The western third of Montana contains numerous mountain ranges. Smaller, "island ranges" are found in the central third of the state, for a total of 77 named ranges of the Rocky Mountains. This geographical fact is reflected in the state's name,...
, leaving Oregon Territory with all of
OregonOregon is a state in the Pacific Northwest region of the United States. It is located on the Pacific coast, with Washington to the north, California to the south, Nevada on the southeast and Idaho to the east. The Columbia and Snake rivers delineate much of Oregon's northern and eastern...
, southern Idaho and a portion of
WyomingWyoming is a state in the mountain region of the Western United States. The western two thirds of the state is covered mostly with the mountain ranges and rangelands in the foothills of the Eastern Rocky Mountains, while the eastern third of the state is high elevation prairie known as the High...
.
December 30, 1853
The
Gadsden PurchaseThe Gadsden Purchase is a region of present-day southern Arizona and southwestern New Mexico that was purchased by the United States in a treaty signed by James Gadsden, the American ambassador to Mexico at the time, on December 30, 1853. It was then ratified, with changes, by the U.S...
added some land to
New Mexico Territorythumb|right|240px|Proposed boundaries for State of New Mexico, 1850The Territory of New Mexico was an organized incorporated territory of the United States that existed from September 9, 1850, until January 6, 1912, when the final extent of the territory was admitted to the Union as the State of...
, corresponding to the southernmost areas of present-day
ArizonaArizona ; is a state located in the southwestern region of the United States. It is also part of the western United States and the mountain west. The capital and largest city is Phoenix...
and
New MexicoNew Mexico is a state located in the southwest and western regions of the United States. New Mexico is also usually considered one of the Mountain States. With a population density of 16 per square mile, New Mexico is the sixth-most sparsely inhabited U.S...
. The present-day Continental United States borders were defined at this point.
May 30, 1854
Kansas TerritoryThe Territory of Kansas was an organized incorporated territory of the United States that existed from May 30, 1854, until January 29, 1861, when the eastern portion of the territory was admitted to the Union as the State of Kansas....
and
Nebraska TerritoryThe Territory of Nebraska was an organized incorporated territory of the United States that existed from May 30, 1854, until March 1, 1867, when the final extent of the territory was admitted to the Union as the State of Nebraska. The Nebraska Territory was created by the Kansas–Nebraska Act of 1854...
were organized; the remaining unorganized land colloquially became known as
Indian TerritoryThe Indian Territory, also known as the Indian Territories and the Indian Country, was land set aside within the United States for the settlement of American Indians...
. Kansas Territory consisted of present-day
KansasKansas is a US state located in the Midwestern United States. It is named after the Kansas River which flows through it, which in turn was named after the Kansa Native American tribe, which inhabited the area. The tribe's name is often said to mean "people of the wind" or "people of the south...
and eastern
ColoradoColorado is a U.S. state that encompasses much of the Rocky Mountains as well as the northeastern portion of the Colorado Plateau and the western edge of the Great Plains...
. Nebraska Territory consisted of present-day
NebraskaNebraska is a state on the Great Plains of the Midwestern United States. The state's capital is Lincoln and its largest city is Omaha, on the Missouri River....
, and parts of
ColoradoColorado is a U.S. state that encompasses much of the Rocky Mountains as well as the northeastern portion of the Colorado Plateau and the western edge of the Great Plains...
,
MontanaMontana is a state in the Western United States. The western third of Montana contains numerous mountain ranges. Smaller, "island ranges" are found in the central third of the state, for a total of 77 named ranges of the Rocky Mountains. This geographical fact is reflected in the state's name,...
,
North DakotaNorth Dakota is a state located in the Midwestern region of the United States of America, along the Canadian border. The state is bordered by Canada to the north, Minnesota to the east, South Dakota to the south and Montana to the west. North Dakota is the 19th-largest state by area in the U.S....
,
South DakotaSouth Dakota is a state located in the Midwestern region of the United States. It is named after the Lakota and Dakota Sioux American Indian tribes. Once a part of Dakota Territory, South Dakota became a state on November 2, 1889. The state has an area of and an estimated population of just over...
, and
WyomingWyoming is a state in the mountain region of the Western United States. The western two thirds of the state is covered mostly with the mountain ranges and rangelands in the foothills of the Eastern Rocky Mountains, while the eastern third of the state is high elevation prairie known as the High...
. Indian Territory corresponds to eastern
OklahomaOklahoma is a state located in the South Central region of the United States of America. With an estimated 3,751,351 residents as of the 2010 census and a land area of 68,667 square miles , Oklahoma is the 28th most populous and 20th-largest state...
.
May 11, 1858
The eastern portion of
Minnesota TerritoryThe Territory of Minnesota was an organized incorporated territory of the United States that existed from March 3, 1849, until May 11, 1858, when the eastern portion of the territory was admitted to the Union as the State of Minnesota.-History:...
was admitted as the 32nd state,
MinnesotaMinnesota is a U.S. state located in the Midwestern United States. The twelfth largest state of the U.S., it is the twenty-first most populous, with 5.3 million residents. Minnesota was carved out of the eastern half of the Minnesota Territory and admitted to the Union as the thirty-second state...
. The remainder became unorganized.
February 14, 1859
The western portion of
Oregon TerritoryThe Territory of Oregon was an organized incorporated territory of the United States that existed from August 14, 1848, until February 14, 1859, when the southwestern portion of the territory was admitted to the Union as the State of Oregon. Originally claimed by several countries , the region was...
was admitted as the 33rd state,
OregonOregon is a state in the Pacific Northwest region of the United States. It is located on the Pacific coast, with Washington to the north, California to the south, Nevada on the southeast and Idaho to the east. The Columbia and Snake rivers delineate much of Oregon's northern and eastern...
. The remainder was assigned to
Washington TerritoryThe Territory of Washington was an organized incorporated territory of the United States that existed from February 8, 1853, until November 11, 1889, when the final extent of the territory was admitted to the Union as the State of Washington....
.
1860s
February 8, 1860
Texas began claiming
Greer County, TexasGreer County, was a county created by the Texas legislature on February 8, 1860 , was land claimed by both Texas and the United States.-Origin of the dispute:...
, controlled at that time by the federal government as unorganized territory, and now in present-day
OklahomaOklahoma is a state located in the South Central region of the United States of America. With an estimated 3,751,351 residents as of the 2010 census and a land area of 68,667 square miles , Oklahoma is the 28th most populous and 20th-largest state...
.
January 29, 1861
The eastern portion of
Kansas TerritoryThe Territory of Kansas was an organized incorporated territory of the United States that existed from May 30, 1854, until January 29, 1861, when the eastern portion of the territory was admitted to the Union as the State of Kansas....
was admitted as the 34th state,
KansasKansas is a US state located in the Midwestern United States. It is named after the Kansas River which flows through it, which in turn was named after the Kansa Native American tribe, which inhabited the area. The tribe's name is often said to mean "people of the wind" or "people of the south...
. A peculiarity arose for the western portion. It was added to
Colorado TerritoryThe Territory of Colorado was an organized incorporated territory of the United States that existed from February 28, 1861, until August 1, 1876, when it was admitted to the Union as the State of Colorado....
on February 28, 1861; however, for the month between statehood for Kansas and the Colorado Territory being formed, it appears to have had no official status.
February 4, 1861
The
Confederate States of AmericaThe Confederate States of America was a government set up from 1861 to 1865 by 11 Southern slave states of the United States of America that had declared their secession from the U.S...
(CSA) was formed. The
Southern statesThe Southern United States—commonly referred to as the American South, Dixie, or simply the South—constitutes a large distinctive area in the southeastern and south-central United States...
secededThe Ordinance of Secession was the document drafted and ratified in 1860 and 1861 by the states officially seceding from the United States of America...
at different dates and joined the CSA at different dates; to simplify the map, only the final form of the CSA is shown here. There were
rebel governmentsThe American Civil War was a civil war fought in the United States of America. In response to the election of Abraham Lincoln as President of the United States, 11 southern slave states declared their secession from the United States and formed the Confederate States of America ; the other 25...
as well as
UnionDuring the American Civil War, the Union was a name used to refer to the federal government of the United States, which was supported by the twenty free states and five border slave states. It was opposed by 11 southern slave states that had declared a secession to join together to form the...
governments in
KentuckyThe Commonwealth of Kentucky is a state located in the East Central United States of America. As classified by the United States Census Bureau, Kentucky is a Southern state, more specifically in the East South Central region. Kentucky is one of four U.S. states constituted as a commonwealth...
and
MissouriMissouri is a US state located in the Midwestern United States, bordered by Iowa, Illinois, Kentucky, Tennessee, Arkansas, Oklahoma, Kansas and Nebraska. With a 2010 population of 5,988,927, Missouri is the 18th most populous state in the nation and the fifth most populous in the Midwest. It...
, and the CSA had full control over
Indian TerritoryThe Indian Territory, also known as the Indian Territories and the Indian Country, was land set aside within the United States for the settlement of American Indians...
. To view a detailed animated map depicting the various state secessions see CSA states evolution.
February 28, 1861
Colorado TerritoryThe Territory of Colorado was an organized incorporated territory of the United States that existed from February 28, 1861, until August 1, 1876, when it was admitted to the Union as the State of Colorado....
was organized, with land from
UtahThe Territory of Utah was an organized incorporated territory of the United States that existed from September 9, 1850, until January 4, 1896, when the final extent of the territory was admitted to the Union as the State of Utah....
,
New Mexicothumb|right|240px|Proposed boundaries for State of New Mexico, 1850The Territory of New Mexico was an organized incorporated territory of the United States that existed from September 9, 1850, until January 6, 1912, when the final extent of the territory was admitted to the Union as the State of...
, and
NebraskaThe Territory of Nebraska was an organized incorporated territory of the United States that existed from May 30, 1854, until March 1, 1867, when the final extent of the territory was admitted to the Union as the State of Nebraska. The Nebraska Territory was created by the Kansas–Nebraska Act of 1854...
Territories, as well as the land left over from
Kansas TerritoryThe Territory of Kansas was an organized incorporated territory of the United States that existed from May 30, 1854, until January 29, 1861, when the eastern portion of the territory was admitted to the Union as the State of Kansas....
; it corresponded already to present-day
ColoradoColorado is a U.S. state that encompasses much of the Rocky Mountains as well as the northeastern portion of the Colorado Plateau and the western edge of the Great Plains...
. Also, the eastern tip of
Washington TerritoryThe Territory of Washington was an organized incorporated territory of the United States that existed from February 8, 1853, until November 11, 1889, when the final extent of the territory was admitted to the Union as the State of Washington....
was transferred to
Nebraska TerritoryThe Territory of Nebraska was an organized incorporated territory of the United States that existed from May 30, 1854, until March 1, 1867, when the final extent of the territory was admitted to the Union as the State of Nebraska. The Nebraska Territory was created by the Kansas–Nebraska Act of 1854...
.
March 2, 1861
Dakota TerritoryThe Territory of Dakota was an organized incorporated territory of the United States that existed from March 2, 1861, until November 2, 1889, when the final extent of the reduced territory was split and admitted to the Union as the states of North and South Dakota.The Dakota Territory consisted of...
was split from
Nebraska TerritoryThe Territory of Nebraska was an organized incorporated territory of the United States that existed from May 30, 1854, until March 1, 1867, when the final extent of the territory was admitted to the Union as the State of Nebraska. The Nebraska Territory was created by the Kansas–Nebraska Act of 1854...
, and included the unorganized land left over from
Minnesota TerritoryThe Territory of Minnesota was an organized incorporated territory of the United States that existed from March 3, 1849, until May 11, 1858, when the eastern portion of the territory was admitted to the Union as the State of Minnesota.-History:...
. Dakota Territory consisted of both present-day
NorthNorth Dakota is a state located in the Midwestern region of the United States of America, along the Canadian border. The state is bordered by Canada to the north, Minnesota to the east, South Dakota to the south and Montana to the west. North Dakota is the 19th-largest state by area in the U.S....
and
South DakotaSouth Dakota is a state located in the Midwestern region of the United States. It is named after the Lakota and Dakota Sioux American Indian tribes. Once a part of Dakota Territory, South Dakota became a state on November 2, 1889. The state has an area of and an estimated population of just over...
, as well as most of
MontanaMontana is a state in the Western United States. The western third of Montana contains numerous mountain ranges. Smaller, "island ranges" are found in the central third of the state, for a total of 77 named ranges of the Rocky Mountains. This geographical fact is reflected in the state's name,...
and northern
WyomingWyoming is a state in the mountain region of the Western United States. The western two thirds of the state is covered mostly with the mountain ranges and rangelands in the foothills of the Eastern Rocky Mountains, while the eastern third of the state is high elevation prairie known as the High...
. Nebraska Territory consisted of all of
NebraskaNebraska is a state on the Great Plains of the Midwestern United States. The state's capital is Lincoln and its largest city is Omaha, on the Missouri River....
and southeastern Wyoming.
Nevada TerritoryThe Territory of Nevada was an organized incorporated territory of the United States that existed from March 2, 1861, until October 31, 1864, when it was admitted to the Union as the State of Nevada....
was split from
Utah TerritoryThe Territory of Utah was an organized incorporated territory of the United States that existed from September 9, 1850, until January 4, 1896, when the final extent of the territory was admitted to the Union as the State of Utah....
, corresponding to northwestern present-day
NevadaNevada is a state in the western, mountain west, and southwestern regions of the United States. With an area of and a population of about 2.7 million, it is the 7th-largest and 35th-most populous state. Over two-thirds of Nevada's people live in the Las Vegas metropolitan area, which contains its...
; the eastern border was the 39th meridian west of
Washington, D.C.Washington, D.C., formally the District of Columbia and commonly referred to as Washington, "the District", or simply D.C., is the capital of the United States. On July 16, 1790, the United States Congress approved the creation of a permanent national capital as permitted by the U.S. Constitution....
August 1, 1861
The
ConfederacyThe Confederate States of America was a government set up from 1861 to 1865 by 11 Southern slave states of the United States of America that had declared their secession from the U.S...
established
Arizona Territory (CSA)The Territory of Arizona was a territory claimed by the Confederate States of America during the American Civil War, between 1861 and 1865. It consisted of the portion of the New Mexico Territory south of the 34th parallel north including parts of the modern states of New Mexico and Arizona. Its...
in the southern half of the Union's
New Mexico Territorythumb|right|240px|Proposed boundaries for State of New Mexico, 1850The Territory of New Mexico was an organized incorporated territory of the United States that existed from September 9, 1850, until January 6, 1912, when the final extent of the territory was admitted to the Union as the State of...
. It would be organized on February 14, 1862. It corresponded to the southern halves of present-day
ArizonaArizona ; is a state located in the southwestern region of the United States. It is also part of the western United States and the mountain west. The capital and largest city is Phoenix...
and
New MexicoNew Mexico is a state located in the southwest and western regions of the United States. New Mexico is also usually considered one of the Mountain States. With a population density of 16 per square mile, New Mexico is the sixth-most sparsely inhabited U.S...
.
July 14, 1862
Due to its nature as a mining and grazing area, land started to be added to
Nevada TerritoryThe Territory of Nevada was an organized incorporated territory of the United States that existed from March 2, 1861, until October 31, 1864, when it was admitted to the Union as the State of Nevada....
to accommodate these activities. Its eastern border was moved eastward from the 39th
meridian west from WashingtonThe Washington meridian was one of four prime meridians of the United States which passed through Washington, D.C.. The four which have been specified are:# through the Capitol# through the White House# through the old Naval Observatory...
, to the 38th meridian west from Washington, transferring the land from
Utah TerritoryThe Territory of Utah was an organized incorporated territory of the United States that existed from September 9, 1850, until January 4, 1896, when the final extent of the territory was admitted to the Union as the State of Utah....
.
February 24, 1863
The Union created its own
Arizona TerritoryThe Territory of Arizona was an organized incorporated territory of the United States that existed from February 24, 1863 until February 14, 1912, when it was admitted to the Union as the 48th state....
, splitting it off from
New Mexico Territorythumb|right|240px|Proposed boundaries for State of New Mexico, 1850The Territory of New Mexico was an organized incorporated territory of the United States that existed from September 9, 1850, until January 6, 1912, when the final extent of the territory was admitted to the Union as the State of...
, making both territories correspond to their present-day states, except for Arizona Territory including the southern tip of present-day
NevadaNevada is a state in the western, mountain west, and southwestern regions of the United States. With an area of and a population of about 2.7 million, it is the 7th-largest and 35th-most populous state. Over two-thirds of Nevada's people live in the Las Vegas metropolitan area, which contains its...
.
March 4, 1863
Idaho TerritoryThe Territory of Idaho was an organized incorporated territory of the United States that existed from March 4, 1863, until July 3, 1890, when the final extent of the territory was admitted to the Union as the State of Idaho.-1860s:...
was created from portions of
WashingtonThe Territory of Washington was an organized incorporated territory of the United States that existed from February 8, 1853, until November 11, 1889, when the final extent of the territory was admitted to the Union as the State of Washington....
,
DakotaThe Territory of Dakota was an organized incorporated territory of the United States that existed from March 2, 1861, until November 2, 1889, when the final extent of the reduced territory was split and admitted to the Union as the states of North and South Dakota.The Dakota Territory consisted of...
, and
NebraskaThe Territory of Nebraska was an organized incorporated territory of the United States that existed from May 30, 1854, until March 1, 1867, when the final extent of the territory was admitted to the Union as the State of Nebraska. The Nebraska Territory was created by the Kansas–Nebraska Act of 1854...
Territories, consisting of present-day
IdahoIdaho is a state in the Rocky Mountain area of the United States. The state's largest city and capital is Boise. Residents are called "Idahoans". Idaho was admitted to the Union on July 3, 1890, as the 43rd state....
,
MontanaMontana is a state in the Western United States. The western third of Montana contains numerous mountain ranges. Smaller, "island ranges" are found in the central third of the state, for a total of 77 named ranges of the Rocky Mountains. This geographical fact is reflected in the state's name,...
, and most of
WyomingWyoming is a state in the mountain region of the Western United States. The western two thirds of the state is covered mostly with the mountain ranges and rangelands in the foothills of the Eastern Rocky Mountains, while the eastern third of the state is high elevation prairie known as the High...
. Nebraska and Washington Territories were left corresponding to their present-day counterparts.
June 20, 1863
The counties of northwestern
VirginiaThe Commonwealth of Virginia , is a U.S. state on the Atlantic Coast of the Southern United States. Virginia is nicknamed the "Old Dominion" and sometimes the "Mother of Presidents" after the eight U.S. presidents born there...
(whose population had opposed secession from the Union and established a
pro-Union state governmentThe Restored Government of Virginia, or the Reorganized Government of Virginia, was the Unionist government of Virginia during the American Civil War. From 1861 until mid-1863 it met in Wheeling, and from 26 August 1863 until June 1865 it met in Alexandria...
) were split off and were admitted as the 35th state,
West VirginiaWest Virginia is a state in the Appalachian and Southeastern regions of the United States, bordered by Virginia to the southeast, Kentucky to the southwest, Ohio to the northwest, Pennsylvania to the northeast and Maryland to the east...
. The new state had been mostly under Union control since late 1861, but is not recognized by the
ConfederateThe Confederate States of America was a government set up from 1861 to 1865 by 11 Southern slave states of the United States of America that had declared their secession from the U.S...
and state governments in Richmond.
May 26, 1864
Montana TerritoryThe Territory of Montana was an organized incorporated territory of the United States that existed from May 28, 1864, until November 8, 1889, when it was admitted to the Union as the State of Montana.-History:...
was split from
Idaho TerritoryThe Territory of Idaho was an organized incorporated territory of the United States that existed from March 4, 1863, until July 3, 1890, when the final extent of the territory was admitted to the Union as the State of Idaho.-1860s:...
, which also had some land transferred to
Dakota TerritoryThe Territory of Dakota was an organized incorporated territory of the United States that existed from March 2, 1861, until November 2, 1889, when the final extent of the reduced territory was split and admitted to the Union as the states of North and South Dakota.The Dakota Territory consisted of...
. Montana Territory corresponded to present-day
MontanaMontana is a state in the Western United States. The western third of Montana contains numerous mountain ranges. Smaller, "island ranges" are found in the central third of the state, for a total of 77 named ranges of the Rocky Mountains. This geographical fact is reflected in the state's name,...
, Idaho Territory consisted of
IdahoIdaho is a state in the Rocky Mountain area of the United States. The state's largest city and capital is Boise. Residents are called "Idahoans". Idaho was admitted to the Union on July 3, 1890, as the 43rd state....
and western
WyomingWyoming is a state in the mountain region of the Western United States. The western two thirds of the state is covered mostly with the mountain ranges and rangelands in the foothills of the Eastern Rocky Mountains, while the eastern third of the state is high elevation prairie known as the High...
, and Dakota Territory included both
NorthNorth Dakota is a state located in the Midwestern region of the United States of America, along the Canadian border. The state is bordered by Canada to the north, Minnesota to the east, South Dakota to the south and Montana to the west. North Dakota is the 19th-largest state by area in the U.S....
and
South DakotaSouth Dakota is a state located in the Midwestern region of the United States. It is named after the Lakota and Dakota Sioux American Indian tribes. Once a part of Dakota Territory, South Dakota became a state on November 2, 1889. The state has an area of and an estimated population of just over...
, and most of Wyoming.
October 31, 1864
Nevada TerritoryThe Territory of Nevada was an organized incorporated territory of the United States that existed from March 2, 1861, until October 31, 1864, when it was admitted to the Union as the State of Nevada....
was admitted as the 36th state,
NevadaNevada is a state in the western, mountain west, and southwestern regions of the United States. With an area of and a population of about 2.7 million, it is the 7th-largest and 35th-most populous state. Over two-thirds of Nevada's people live in the Las Vegas metropolitan area, which contains its...
; it was a bit smaller than it is today, lacking area in both the east and south.
April 9, 1865
The
main armyThe Army of Northern Virginia was the primary military force of the Confederate States of America in the Eastern Theater of the American Civil War, as well as the primary command structure of the Department of Northern Virginia. It was most often arrayed against the Union Army of the Potomac...
of the
Confederate States of AmericaThe Confederate States of America was a government set up from 1861 to 1865 by 11 Southern slave states of the United States of America that had declared their secession from the U.S...
surrenderedThe Battle of Appomattox Court House, fought on the morning of April 9, 1865, was the final engagement of Confederate States Army General Robert E. Lee's Army of Northern Virginia before it surrendered to the Union Army under Lt. Gen. Ulysses S. Grant, and one of the last battles of the American...
, and the Confederacy dissolved soon afterward. Much of the Confederate States' territory had already been retaken by force of arms prior to this point and the process of Reconstruction and readmission to the union would take several years following the Confederacy's collapse; to simplify the map, the former Confederate states are shown as already readmitted. To view a detailed animated map depicting the various state readmission during Reconstruction see CSA states evolution.
May 5, 1866
NevadaNevada is a state in the western, mountain west, and southwestern regions of the United States. With an area of and a population of about 2.7 million, it is the 7th-largest and 35th-most populous state. Over two-thirds of Nevada's people live in the Las Vegas metropolitan area, which contains its...
's eastern border was moved from the 38th
meridian west from WashingtonThe Washington meridian was one of four prime meridians of the United States which passed through Washington, D.C.. The four which have been specified are:# through the Capitol# through the White House# through the old Naval Observatory...
, to the 37th meridian west from Washington, transferring land to it from
Utah TerritoryThe Territory of Utah was an organized incorporated territory of the United States that existed from September 9, 1850, until January 4, 1896, when the final extent of the territory was admitted to the Union as the State of Utah....
.
January 18, 1867
The northwestern corner of
Arizona TerritoryThe Territory of Arizona was an organized incorporated territory of the United States that existed from February 24, 1863 until February 14, 1912, when it was admitted to the Union as the 48th state....
was transferred to the state of
NevadaNevada is a state in the western, mountain west, and southwestern regions of the United States. With an area of and a population of about 2.7 million, it is the 7th-largest and 35th-most populous state. Over two-thirds of Nevada's people live in the Las Vegas metropolitan area, which contains its...
, giving it its present-day borders.
March 1, 1867
Nebraska TerritoryThe Territory of Nebraska was an organized incorporated territory of the United States that existed from May 30, 1854, until March 1, 1867, when the final extent of the territory was admitted to the Union as the State of Nebraska. The Nebraska Territory was created by the Kansas–Nebraska Act of 1854...
was admitted as the 37th state,
NebraskaNebraska is a state on the Great Plains of the Midwestern United States. The state's capital is Lincoln and its largest city is Omaha, on the Missouri River....
.
October 11, 1867
The United States
purchased AlaskaThe Alaska Purchase was the acquisition of the Alaska territory by the United States from Russia in 1867 by a treaty ratified by the Senate. The purchase, made at the initiative of United States Secretary of State William H. Seward, gained of new United States territory...
from
RussiaRussia or , officially known as both Russia and the Russian Federation , is a country in northern Eurasia. It is a federal semi-presidential republic, comprising 83 federal subjects...
; it was designated the
Department of AlaskaThe Department of Alaska was the designation for the government of Alaska from its purchase by the United States of America in 1867 until its organization as the District of Alaska in 1884. During the department era, Alaska was variously under the jurisdiction of the U.S. Army , the United States...
, and corresponds, except for a
boundary disputeThe Alaska boundary dispute was a territorial dispute between the United States and Canada . It was resolved by arbitration in 1903. The dispute had been going on between the Russian and British Empires since 1821, and was inherited by the United States as a consequence of the Alaska Purchase in...
, to present-day
AlaskaAlaska is the largest state in the United States by area. It is situated in the northwest extremity of the North American continent, with Canada to the east, the Arctic Ocean to the north, and the Pacific Ocean to the west and south, with Russia further west across the Bering Strait...
.
July 25, 1868
Wyoming TerritoryThe Territory of Wyoming was an organized incorporated territory of the United States that existed from July 25, 1868, until July 10, 1890, when it was admitted to the Union as the State of Wyoming. Cheyenne was the territorial capital...
was formed from portions of
DakotaThe Territory of Dakota was an organized incorporated territory of the United States that existed from March 2, 1861, until November 2, 1889, when the final extent of the reduced territory was split and admitted to the Union as the states of North and South Dakota.The Dakota Territory consisted of...
,
IdahoThe Territory of Idaho was an organized incorporated territory of the United States that existed from March 4, 1863, until July 3, 1890, when the final extent of the territory was admitted to the Union as the State of Idaho.-1860s:...
, and
UtahThe Territory of Utah was an organized incorporated territory of the United States that existed from September 9, 1850, until January 4, 1896, when the final extent of the territory was admitted to the Union as the State of Utah....
Territories, corresponding to the present-day borders of
WyomingWyoming is a state in the mountain region of the Western United States. The western two thirds of the state is covered mostly with the mountain ranges and rangelands in the foothills of the Eastern Rocky Mountains, while the eastern third of the state is high elevation prairie known as the High...
.
1870s
October 21, 1872
San Juan IslandsThe San Juan Islands are an archipelago in the northwest corner of the contiguous United States between the US mainland and Vancouver Island, British Columbia, Canada. The San Juan Islands are part of the U.S...
awarded to the U.S., formally ending the
Pig WarThe Pig War was a confrontation in 1859 between the United States and the British Empire over the boundary between the US and British North America. The territory in dispute was the San Juan Islands, which lie between Vancouver Island and the North American mainland...
with Britain.
August 1, 1876
Colorado TerritoryThe Territory of Colorado was an organized incorporated territory of the United States that existed from February 28, 1861, until August 1, 1876, when it was admitted to the Union as the State of Colorado....
was admitted as the 38th state,
ColoradoColorado is a U.S. state that encompasses much of the Rocky Mountains as well as the northeastern portion of the Colorado Plateau and the western edge of the Great Plains...
.
1880s
March 28, 1882
The part of
Dakota TerritoryThe Territory of Dakota was an organized incorporated territory of the United States that existed from March 2, 1861, until November 2, 1889, when the final extent of the reduced territory was split and admitted to the Union as the states of North and South Dakota.The Dakota Territory consisted of...
south of 43° north and north of the
Keya PahaThe Keya Paha River is a river flowing through the U.S. states of South Dakota and Nebraska.The name is derived from the Dakota language ke'-ya pa-ha, meaning "turtle hill"...
and
NiobraraThe Niobrara River is a tributary of the Missouri River, approximately long, running through the U.S. states of Wyoming and Nebraska. The river drains one of the most arid sections of the Great Plains, and has a low flow for a river of its length...
Rivers was transferred to
NebraskaNebraska is a state on the Great Plains of the Midwestern United States. The state's capital is Lincoln and its largest city is Omaha, on the Missouri River....
.
May 17, 1884
The
Department of AlaskaThe Department of Alaska was the designation for the government of Alaska from its purchase by the United States of America in 1867 until its organization as the District of Alaska in 1884. During the department era, Alaska was variously under the jurisdiction of the U.S. Army , the United States...
, previously under the direct control of the federal government and the military, was redesignated the
District of AlaskaThe District of Alaska was the governmental designation for Alaska from May 17, 1884 to August 24, 1912, when it became Alaska Territory. Previously it had been known as the Department of Alaska. At the time, legislators in Washington, D.C., were occupied with post-Civil War reconstruction issues,...
, forming a local government.
November 2, 1889
Dakota TerritoryThe Territory of Dakota was an organized incorporated territory of the United States that existed from March 2, 1861, until November 2, 1889, when the final extent of the reduced territory was split and admitted to the Union as the states of North and South Dakota.The Dakota Territory consisted of...
was split in two, and it was admitted as the 39th state,
North DakotaNorth Dakota is a state located in the Midwestern region of the United States of America, along the Canadian border. The state is bordered by Canada to the north, Minnesota to the east, South Dakota to the south and Montana to the west. North Dakota is the 19th-largest state by area in the U.S....
, and 40th state,
South DakotaSouth Dakota is a state located in the Midwestern region of the United States. It is named after the Lakota and Dakota Sioux American Indian tribes. Once a part of Dakota Territory, South Dakota became a state on November 2, 1889. The state has an area of and an estimated population of just over...
.
November 8, 1889
Montana TerritoryThe Territory of Montana was an organized incorporated territory of the United States that existed from May 28, 1864, until November 8, 1889, when it was admitted to the Union as the State of Montana.-History:...
was admitted as the 41st state,
MontanaMontana is a state in the Western United States. The western third of Montana contains numerous mountain ranges. Smaller, "island ranges" are found in the central third of the state, for a total of 77 named ranges of the Rocky Mountains. This geographical fact is reflected in the state's name,...
.
November 11, 1889
Washington TerritoryThe Territory of Washington was an organized incorporated territory of the United States that existed from February 8, 1853, until November 11, 1889, when the final extent of the territory was admitted to the Union as the State of Washington....
was admitted as the 42nd state, Washington.
1890s
May 2, 1890
Oklahoma TerritoryThe Territory of Oklahoma was an organized incorporated territory of the United States that existed from May 2, 1890, until November 16, 1907, when it was joined with the Indian Territory under a new constitution and admitted to the Union as the State of Oklahoma.-Organization:Oklahoma Territory's...
was organized from the western portion of
Indian TerritoryThe Indian Territory, also known as the Indian Territories and the Indian Country, was land set aside within the United States for the settlement of American Indians...
, and included the Neutral Strip, and corresponded to the western half of present-day
OklahomaOklahoma is a state located in the South Central region of the United States of America. With an estimated 3,751,351 residents as of the 2010 census and a land area of 68,667 square miles , Oklahoma is the 28th most populous and 20th-largest state...
.
July 3, 1890
Idaho TerritoryThe Territory of Idaho was an organized incorporated territory of the United States that existed from March 4, 1863, until July 3, 1890, when the final extent of the territory was admitted to the Union as the State of Idaho.-1860s:...
was admitted as the 43rd state,
IdahoIdaho is a state in the Rocky Mountain area of the United States. The state's largest city and capital is Boise. Residents are called "Idahoans". Idaho was admitted to the Union on July 3, 1890, as the 43rd state....
.
July 10, 1890
Wyoming TerritoryThe Territory of Wyoming was an organized incorporated territory of the United States that existed from July 25, 1868, until July 10, 1890, when it was admitted to the Union as the State of Wyoming. Cheyenne was the territorial capital...
was admitted as the 44th state,
WyomingWyoming is a state in the mountain region of the Western United States. The western two thirds of the state is covered mostly with the mountain ranges and rangelands in the foothills of the Eastern Rocky Mountains, while the eastern third of the state is high elevation prairie known as the High...
.
July 4, 1894
The
Kingdom of HawaiiThe Kingdom of Hawaii was established during the years 1795 to 1810 with the subjugation of the smaller independent chiefdoms of Oahu, Maui, Molokai, Lānai, Kauai and Niihau by the chiefdom of Hawaii into one unified government...
became the
Republic of HawaiiThe Republic of Hawaii was the formal name of the government that controlled Hawaii from 1894 to 1898 when it was run as a republic. The republic period occurred between the administration of the Provisional Government of Hawaii which ended on July 4, 1894 and the adoption of the Newlands...
.
January 4, 1896
Utah TerritoryThe Territory of Utah was an organized incorporated territory of the United States that existed from September 9, 1850, until January 4, 1896, when the final extent of the territory was admitted to the Union as the State of Utah....
was admitted as the 45th state,
UtahUtah is a state in the Western United States. It was the 45th state to join the Union, on January 4, 1896. Approximately 80% of Utah's 2,763,885 people live along the Wasatch Front, centering on Salt Lake City. This leaves vast expanses of the state nearly uninhabited, making the population the...
.
May 4, 1896
A
Supreme CourtThe Supreme Court of the United States is the highest court in the United States. It has ultimate appellate jurisdiction over all state and federal courts, and original jurisdiction over a small range of cases...
ruling officially assigns
Greer CountyGreer County, was a county created by the Texas legislature on February 8, 1860 , was land claimed by both Texas and the United States.-Origin of the dispute:...
to
Oklahoma TerritoryThe Territory of Oklahoma was an organized incorporated territory of the United States that existed from May 2, 1890, until November 16, 1907, when it was joined with the Indian Territory under a new constitution and admitted to the Union as the State of Oklahoma.-Organization:Oklahoma Territory's...
.
August 12, 1898
The
Republic of HawaiiThe Republic of Hawaii was the formal name of the government that controlled Hawaii from 1894 to 1898 when it was run as a republic. The republic period occurred between the administration of the Provisional Government of Hawaii which ended on July 4, 1894 and the adoption of the Newlands...
was annexed by the United States.
20th century
June 14, 1900
The annexed Hawaiian islands were organized as the
Territory of HawaiiThe Territory of Hawaii or Hawaii Territory was an organized incorporated territory of the United States that existed from July 7, 1898, until August 21, 1959, when its territory, with the exception of Johnston Atoll, was admitted to the Union as the fiftieth U.S. state, the State of Hawaii.The U.S...
, and corresponded, except for including
Palmyra AtollPalmyra Atoll is an essentially unoccupied equatorial Northern Pacific atoll administered as an unorganized incorporated territory by the United States federal government...
, to the present-day state of
HawaiiHawaii is the newest of the 50 U.S. states , and is the only U.S. state made up entirely of islands. It is the northernmost island group in Polynesia, occupying most of an archipelago in the central Pacific Ocean, southwest of the continental United States, southeast of Japan, and northeast of...
.
October 20, 1903
The
Alaska boundary disputeThe Alaska boundary dispute was a territorial dispute between the United States and Canada . It was resolved by arbitration in 1903. The dispute had been going on between the Russian and British Empires since 1821, and was inherited by the United States as a consequence of the Alaska Purchase in...
is resolved by arbitration, generally favoring the American claim.
November 16, 1907
Oklahoma TerritoryThe Territory of Oklahoma was an organized incorporated territory of the United States that existed from May 2, 1890, until November 16, 1907, when it was joined with the Indian Territory under a new constitution and admitted to the Union as the State of Oklahoma.-Organization:Oklahoma Territory's...
and
Indian TerritoryThe Indian Territory, also known as the Indian Territories and the Indian Country, was land set aside within the United States for the settlement of American Indians...
were combined and admitted as the 46th state,
OklahomaOklahoma is a state located in the South Central region of the United States of America. With an estimated 3,751,351 residents as of the 2010 census and a land area of 68,667 square miles , Oklahoma is the 28th most populous and 20th-largest state...
.
January 6, 1912
New Mexico Territorythumb|right|240px|Proposed boundaries for State of New Mexico, 1850The Territory of New Mexico was an organized incorporated territory of the United States that existed from September 9, 1850, until January 6, 1912, when the final extent of the territory was admitted to the Union as the State of...
was admitted as the 47th state,
New MexicoNew Mexico is a state located in the southwest and western regions of the United States. New Mexico is also usually considered one of the Mountain States. With a population density of 16 per square mile, New Mexico is the sixth-most sparsely inhabited U.S...
.
February 14, 1912
Arizona TerritoryThe Territory of Arizona was an organized incorporated territory of the United States that existed from February 24, 1863 until February 14, 1912, when it was admitted to the Union as the 48th state....
was admitted as the 48th state,
ArizonaArizona ; is a state located in the southwestern region of the United States. It is also part of the western United States and the mountain west. The capital and largest city is Phoenix...
.
August 24, 1912
The
District of AlaskaThe District of Alaska was the governmental designation for Alaska from May 17, 1884 to August 24, 1912, when it became Alaska Territory. Previously it had been known as the Department of Alaska. At the time, legislators in Washington, D.C., were occupied with post-Civil War reconstruction issues,...
was organized as
Alaska TerritoryThe Territory of Alaska was an organized incorporated territory of the United States that existed from August 24, 1912, until January 3, 1959, when it was admitted to the Union as the State of Alaska...
.
March 28, 1921
The dispute over a square mile between
DelawareDelaware is a U.S. state located on the Atlantic Coast in the Mid-Atlantic region of the United States. It is bordered to the south and west by Maryland, and to the north by Pennsylvania...
and
PennsylvaniaThe Commonwealth of Pennsylvania is a U.S. state that is located in the Northeastern and Mid-Atlantic regions of the United States. The state borders Delaware and Maryland to the south, West Virginia to the southwest, Ohio to the west, New York and Ontario, Canada, to the north, and New Jersey to...
,
The WedgeThe Wedge is a small tract of land along the borders of Delaware, Maryland and Pennsylvania. Ownership of the land was disputed until 1921; it is now recognized as part of Delaware. The tract was created primarily due to the shortcomings of contemporary surveying techniques...
, is finally resolved in favor of Delaware.
January 3, 1959
Alaska TerritoryThe Territory of Alaska was an organized incorporated territory of the United States that existed from August 24, 1912, until January 3, 1959, when it was admitted to the Union as the State of Alaska...
was admitted as the 49th state,
AlaskaAlaska is the largest state in the United States by area. It is situated in the northwest extremity of the North American continent, with Canada to the east, the Arctic Ocean to the north, and the Pacific Ocean to the west and south, with Russia further west across the Bering Strait...
.
August 21, 1959
Hawaii TerritoryThe Territory of Hawaii or Hawaii Territory was an organized incorporated territory of the United States that existed from July 7, 1898, until August 21, 1959, when its territory, with the exception of Johnston Atoll, was admitted to the Union as the fiftieth U.S. state, the State of Hawaii.The U.S...
was admitted as the 50th state,
HawaiiHawaii is the newest of the 50 U.S. states , and is the only U.S. state made up entirely of islands. It is the northernmost island group in Polynesia, occupying most of an archipelago in the central Pacific Ocean, southwest of the continental United States, southeast of Japan, and northeast of...
, resulting in the present-day situation of the United States. The statehood act specifically excluded
Palmyra AtollPalmyra Atoll is an essentially unoccupied equatorial Northern Pacific atoll administered as an unorganized incorporated territory by the United States federal government...
from the new state; it thus became unorganized land. Since it had been incorporated as part of the Hawaii Territory, Palmyra Atoll became the only incorporated territory left in the United States.
January 14, 1963
The
Chamizal DisputeThe Chamizal dispute was a border conflict over about on the U.S.-Mexico border between El Paso, Texas, and Ciudad Juárez, Chihuahua. It was caused by differences between the bed of the Rio Grande as surveyed in 1852 and the present channel of the river....
with Mexico over about 600 acres (2.4 km2) on the U.S.-Mexico border between El Paso, Texas, and Ciudad Juárez, Chihuahua is resolved. It was caused by differences between the bed of the Rio Grande as surveyed in 1852 and the present channel of the river.
1970
The city of
Rio Rico, TexasRio Rico is a city near the Rio Grande in the Mexican state of Tamaulipas; it and the surrounding land were part of the US state of Texas that was ceded by the United States to Mexico in 1970...
, was ceded to
MexicoThe United Mexican States , commonly known as Mexico , is a federal constitutional republic in North America. It is bordered on the north by the United States; on the south and west by the Pacific Ocean; on the southeast by Guatemala, Belize, and the Caribbean Sea; and on the east by the Gulf of...
in the
Boundary Treaty of 1970The 1970 Boundary Treaty between the United States and Mexico settled all then pending boundary disputes and uncertainties related to the Rio Grande border. The most significant dispute remaining after the Chamizal Settlement in 1963 involved the location of the boundary in the area of Presidio,...
. The handover officially took place in 1977 and the city was added to the Mexican state of
TamaulipasTamaulipas officially Estado Libre y Soberano de Tamaulipas is one of the 31 states which, with the Federal District, comprise the 32 Federal Entities of Mexico. It is divided in 43 municipalities and its capital city is Ciudad Victoria. The capital city was named after Guadalupe Victoria, the...
.
See also
- Geography of the United States
The United States is a country in the Western Hemisphere. It consists of forty-eight contiguous states in North America, Alaska, a peninsula which forms the northwestern most part of North America, and Hawaii, an archipelago in the Pacific Ocean. There are several United States territories in the...
- History of the United States
The history of the United States traditionally starts with the Declaration of Independence in the year 1776, although its territory was inhabited by Native Americans since prehistoric times and then by European colonists who followed the voyages of Christopher Columbus starting in 1492. The...
- List of U.S. states by date of statehood
- Territorial evolution of U.S. states:
- Territorial evolution of Arizona
- Territorial evolution of California
- Territorial evolution of Colorado
- Territorial evolution of Idaho
- Territorial evolution of Montana
- Territorial evolution of Nevada
- Territorial evolution of New Mexico
thumb|240px|An enlargeable map of the United States after the [[Treaty of Paris |Treaty of Paris]] in 1789thumb|240px|An enlargeable map of the United States after the [[Louisiana Purchase]] in 1803...
- Territorial evolution of North Dakota
- Territorial evolution of Oregon
- Territorial evolution of South Dakota
- Territorial evolution of Utah
- Territorial evolution of Washington
- Territorial evolution of Wyoming
- United States territorial acquisitions
This is a simplified list of United States territorial acquisitions, beginning with American independence. Note that this list primarily concerns land acquired from other nation-states; the numerous territorial acquisitions from American Indians are not listed here.-1783-1848:*The 1783 Treaty of...
- United States territory
United States territory is any extent of region under the jurisdiction of the federal government of the United States, including all waters including all U.S. Naval carriers. The United States has traditionally proclaimed the sovereign rights for exploring, exploiting, conserving, and managing its...
- U.S. state
A U.S. state is any one of the 50 federated states of the United States of America that share sovereignty with the federal government. Because of this shared sovereignty, an American is a citizen both of the federal entity and of his or her state of domicile. Four states use the official title of...
Further reading
- Stein, Mark, How the States Got Their Shapes, New York : Smithsonian Books/Collins, 2008. ISBN 9780061431388
External links