United States Army
Overview
 
The United States Army is the main branch of the United States Armed Forces
United States armed forces
The United States Armed Forces are the military forces of the United States. They consist of the Army, Navy, Marine Corps, Air Force, and Coast Guard.The United States has a strong tradition of civilian control of the military...

 responsible for land-based military
Army
An army An army An army (from Latin arma "arms, weapons" via Old French armée, "armed" (feminine), in the broadest sense, is the land-based military of a nation or state. It may also include other branches of the military such as the air force via means of aviation corps...

 operations. It is the largest and oldest established branch of the U.S. military, and is one of seven U.S. uniformed services
Uniformed services of the United States
The United States has seven federal uniformed services that commission officers as defined by Title 10, and subsequently structured and organized by Title 10, Title 14, Title 33 and Title 42 of the United States Code.-Uniformed services:...

. The modern army has its roots in the Continental Army
Continental Army
The Continental Army was formed after the outbreak of the American Revolutionary War by the colonies that became the United States of America. Established by a resolution of the Continental Congress on June 14, 1775, it was created to coordinate the military efforts of the Thirteen Colonies in...

 which was formed on 14 June 1775, before the establishment of the United States, to meet the demands of the American Revolutionary War
American Revolutionary War
The 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...

. The Congress of the Confederation
Congress of the Confederation
The Congress of the Confederation or the United States in Congress Assembled was the governing body of the United States of America that existed from March 1, 1781, to March 4, 1789. It comprised delegates appointed by the legislatures of the states. It was the immediate successor to the Second...

 officially created the United States Army on 3 June 1784 after the end of the Revolutionary War to replace the disbanded Continental Army.
Timeline

1775    American Revolutionary War: the Continental Army is established by the Continental Congress, marking the birth of the United States Army.

1789    The United States Department of War first establishes a regular army with a strength of several hundred men.

1806    Pike expedition: United States Army Lieutenant Zebulon Pike begins an expedition from Fort Bellefontaine near St. Louis, Missouri, to explore the west.

1835    Osceola leads his Seminole warriors in Florida into the Second Seminole War against the United States Army.

1856    American Old West: On the Sonoita River in present-day southern Arizona, the United States Army establishes Fort Buchanan in order to help control new land acquired in the Gadsden Purchase.

1861    American Civil War: Baltimore riot of 1861, a pro-Secession mob in Baltimore, Maryland, attacks United States Army troops marching through the city.

1861    American Civil War: Robert E. Lee resigns his commission in the United States Army in order to command the forces of the state of Virginia.

1861    The United States Army abolishes flogging.

1861    American Civil War: Citing failing health, Union General Winfield Scott resigns as Commander of the United States Army.

1873    A group of Modoc warriors defeat the United States Army in the First Battle of the Stronghold, a part of the Modoc War.

 
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