What nation has the longest border with the U.S.?
The Canada - United States border is the international border between Canada and the United States. Officially known as the International Boundary, it is the longest common border in the world that is unmilitarized. The terrestrial boundary (including small portions of maritime boundaries on the Atlantic, Pacific, and Arctic coasts, as well as the Great Lakes) is 8,891 kilometres (5,525 mi) long, including 2,475 kilometres (1,538 mi) shared with Alaska. It is Canada's only land border, and Canada is by far the largest country with this distinction.
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