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The Canada–United States border is the longest international border in the world. [a] ... Along the 49th parallel, the border vista is theoretically straight, but ...
In 1909 the United States, United Kingdom, and Canada signed and ratified a treaty confirming the original survey lines as the official and permanent international border. Nevertheless, in 2002 the difference of the survey from the geographical 49th parallel was argued in front of the Washington Supreme Court in the case of State of Washington v.
The international border between Canada and the United States, with Yukon on one side and Alaska on the other, circa 1900-1923 [1]. The borders of Canada include: . To the south and west: An international boundary with the United States, forming the longest shared border in the world, 8,893 km (5,526 mi); [2] (Informally referred as the 49th parallel north which makes up the boundary at parts.
Excluding surveying errors, [2] it is the only place in the contiguous United States north of the 49th parallel, which forms the border between the U.S. and Canada from the Northwest Angle westward to the Strait of Georgia (between the U.S. state of Washington and the Canadian province of British Columbia).
When the Colony of British Columbia joined Canada in 1871, the 49th parallel and marine boundaries established by the Oregon Treaty became the Canada–US border. In order to ensure that Britain retained all of Vancouver Island and the southern Gulf Islands, it was agreed that the border would swing south around that area.
The Americans suggested dividing the Pacific Northwest along the 49th parallel, which was the border between the United States and British North America east of the Rocky Mountains. The lack of accurate cartographic knowledge led American diplomats to declare the Louisiana Purchase gave them an incontestable claim to the region. [ 9 ]
In 1842, a treaty between the U.S. and Great Britain partially resolved a conflict over the US-Canada border involving the Oregon Territory, which included what are now three states.
This border vista is a 20-foot-wide (6.1 m) man-made cut-through of forestland maintained along areas of the border with dense forestation. There are many different sections of the vista, and the total length can vary depending on cycles of maintenance and upkeep, but an approximate length of 1,349 miles (2,171 km) has been reported by the United States Department of Homeland Security (DHS).