List of areas disputed by Canada and the United States
Encyclopedia
Although Canada
Canada
Canada 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...

 and the United States
United States
The United States of America is a federal constitutional republic comprising fifty states and a federal district...

 share the longest non-militarized border between two countries, there is a long history of disputes about the border's demarcation.

Current disputes

  • Machias Seal Island
    Machias Seal Island
    Machias Seal Island is an island located in the Gulf of Maine, approximately southeast from Cutler, Maine, and approximately southwest of Southwest Head, New Brunswick on Grand Manan Island. Machias Seal Island is located at and measures approximately in area. It is a neighbour to North Rock....

     44°30′10"N 67°06′10"W and North Rock
    North Rock
    North Rock is an offshore rock with geographical coordinates of , located to the east of the North American continent near the boundary between the Gulf of Maine and the Bay of Fundy....

     44.53795°N 67.08805°W (Maine
    Maine
    Maine 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...

     / New Brunswick
    New Brunswick
    New Brunswick is one of Canada's three Maritime provinces and is the only province in the federation that is constitutionally bilingual . The provincial capital is Fredericton and Saint John is the most populous city. Greater Moncton is the largest Census Metropolitan Area...

    ), also known as the "Grey Zone"
  • Strait of Juan de Fuca
    Strait of Juan de Fuca
    The Strait of Juan de Fuca is a large body of water about long that is the Salish Sea outlet to the Pacific Ocean...

     48°17′58"N 124°02′58"W (Washington / British Columbia
    British Columbia
    British 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...

    )
  • Dixon Entrance
    Dixon Entrance
    The Dixon Entrance is a strait about long and wide in the Pacific Ocean at the International Boundary between the U.S. state of Alaska and the province of British Columbia in Canada. It was named by Joseph Banks for Captain George Dixon, a Royal Navy officer, fur trader, and explorer, who...

     54°22′N 132°20′W (Alaska
    Alaska
    Alaska 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...

     / British Columbia
    British Columbia
    British 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...

    )
  • Yukon–Alaska dispute, Beaufort Sea
    Beaufort Sea
    The Beaufort Sea is a marginal sea of the Arctic Ocean, located north of the Northwest Territories, the Yukon, and Alaska, west of Canada's Arctic islands. The sea is named after hydrographer Sir Francis Beaufort...

     72°01′40"N 137°02′30"W (Alaska
    Alaska
    Alaska 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...

     / Yukon
    Yukon
    Yukon is the westernmost and smallest of Canada's three federal territories. It was named after the Yukon River. The word Yukon means "Great River" in Gwich’in....

    )
  • Northwest Passage
    Northwest Passage
    The Northwest Passage is a sea route through the Arctic Ocean, along the northern coast of North America via waterways amidst the Canadian Arctic Archipelago, connecting the Atlantic and Pacific Oceans...

    , Canada claims the passage as part of its "internal waters
    Canadian Internal Waters
    Canadian Internal Waters is a Canadian term that refers to "...the waters on the landward side of the baselines of the territorial sea of Canada,..."....

    " belonging to Canada, while the United States regards it as an "international strait
    Territorial waters
    Territorial waters, or a territorial sea, as defined by the 1982 United Nations Convention on the Law of the Sea, is a belt of coastal waters extending at most from the baseline of a coastal state...

    " (a strait accommodating open international traffic).

Historical disputes

  • Alaska boundary dispute
    Alaska Boundary Dispute
    The 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...

     (Alaska
    Alaska
    Alaska 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...

     / British Columbia
    British Columbia
    British 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...

     and Yukon
    Yukon
    Yukon is the westernmost and smallest of Canada's three federal territories. It was named after the Yukon River. The word Yukon means "Great River" in Gwich’in....

    )
    • Atlin District
      Atlin District
      The Atlin District, also known as the Atlin Country, is a historical region located in the far northwestern corner of the Canadian province of British Columbia, centred on Atlin Lake and the gold-rush capital of the region, the town of Atlin...

  • Aroostook War
    Aroostook War
    The Aroostook War was an undeclared nonviolent confrontation in 1838/1839 between the United States and Great Britain over the international boundary between British North America and Maine. The compromise resolution win a mutually accepted border between the state of Maine and the provinces of...

     (Maine
    Maine
    Maine 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...

     / New Brunswick
    New Brunswick
    New Brunswick is one of Canada's three Maritime provinces and is the only province in the federation that is constitutionally bilingual . The provincial capital is Fredericton and Saint John is the most populous city. Greater Moncton is the largest Census Metropolitan Area...

    )
  • Bering Sea Arbitration
    Bering Sea Arbitration
    The Bering Sea Arbitration arose out of a fishery dispute between Great Britain and the United States in the 1880s which was closed by this arbitration in 1893.-Origins:...

  • Oregon boundary dispute
    Oregon boundary dispute
    The Oregon boundary dispute, or the Oregon Question, arose as a result of competing British and American claims to the Pacific Northwest of North America in the first half of the 19th century. Both the United Kingdom and the United States had territorial and commercial aspirations in the region...

     (Columbia District
    Columbia District
    The Columbia District was a fur trading district in the Pacific Northwest region of British North America in the 19th century. It was explored by the North West Company between 1793 and 1811, and established as an operating fur district around 1810...

     and New Caledonia
    New Caledonia (Canada)
    New Caledonia was the name given to a district of the Hudson's Bay Company that comprised the territory largely coterminous with the present-day province of British Columbia, Canada. Though not a British colony, New Caledonia was part of the British claim to North America. Its administrative...

     / Oregon Country
    Oregon Country
    The 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...

    )
  • Pig War
    Pig War
    The 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...

     (Colony of Vancouver Island
    Colony of Vancouver Island
    The Colony of Vancouver Island , was a crown colony of British North America from 1849 to 1866, after which it was united with British Columbia. The united colony joined the Dominion of Canada through Confederation in 1871...

     / Washington Territory
    Washington Territory
    The 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....

    )
  • Republic of Indian Stream
    Republic of Indian Stream
    The Republic of Indian Stream was a small, unrecognized, constitutional republic in North America, along the section of the US–Canada border that divides the Canadian province of Quebec from the US state of New Hampshire. It existed from July 9, 1832 to 1835...

     (New Hampshire
    New Hampshire
    New 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...

     / Quebec
    Quebec
    Quebec or is a province in east-central Canada. It is the only Canadian province with a predominantly French-speaking population and the only one whose sole official language is French at the provincial level....

    )
  • Republic of Madawaska
    Republic of Madawaska
    The Republic of Madawaska was a small, unrecognized state in the northwest corner of Madawaska County, New Brunswick and adjacent areas of Aroostook County in the American state of Maine and of Quebec. The word "Madawaska" comes from the Mi'kmaq words madawas and kak...

     (Maine
    Maine
    Maine 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...

     / New Brunswick
    New Brunswick
    New Brunswick is one of Canada's three Maritime provinces and is the only province in the federation that is constitutionally bilingual . The provincial capital is Fredericton and Saint John is the most populous city. Greater Moncton is the largest Census Metropolitan Area...

    )

See also

  • Colonial history of the United States
  • Former colonies and territories in Canada
    Former colonies and territories in Canada
    Former colonies, territories, boundaries, and claims in Canada prior to the current classification of provinces and territories. In North America, ethnographers commonly classify Aboriginals into ten geographical regions with shared cultural traits and by related linguistic dialects...

  • Territorial evolution of Canada
    Territorial evolution of Canada
    The federation of Canada was created in 1867 when three colonies of British North America were united. One of these colonies split into two new provinces, three other colonies joined later...

     after 1867
  • United States Declaration of Independence
    United States Declaration of Independence
    The Declaration of Independence was a statement adopted by the Continental Congress on July 4, 1776, which announced that the thirteen American colonies then at war with Great Britain regarded themselves as independent states, and no longer a part of the British Empire. John Adams put forth a...

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