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U.S.-Canada relations: A timeline
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Infographic map of the United States-Canada border, totaling 5,525 miles or 8,890 kilometers: 1,538 miles with Alaska and 3,987 miles across the contiguous United States. Canadians protest, 1911-style Cordial ties Unique relationship Address to Parliament History retold Welcoming strangers United States–Mexico–Canada Agreement Canadians protest, 2025-style Signs of the times
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Infographic map of the United States-Canada border, totaling 5,525 miles or 8,890 kilometers: 1,538 miles with Alaska and 3,987 miles across the contiguous United States.
U.S.-Canada border At 5,525 miles (8,890 km), the border separating the United States and Canada is the world's longest.

U.S.-Canada relations: A timeline

From tariff skirmishes to acts of bravery, the two countries with the longest border have long found ways to get along.
Written by
Tracy Grant
Tracy Grant is a senior editor at Encyclopaedia Britannica. She previously served as editor in chief, the first woman to hold that title. 
Tracy Grant
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Britannica Editors
Encyclopaedia Britannica's editors oversee subject areas in which they have extensive knowledge, whether from years of experience gained by working on that content or via study for an advanced degree....
Britannica Editors
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•History

This history of the relationship between the United States and Canada is perhaps best told in the story of the border. The United States dates to 1776 and Canada (as a self-governing country) to 1867, but the two countries didn’t get around to officially demarcating the border between them until 1908. Why did it take so long? Well, because with the exception of a few War of 1812 border skirmishes, there really wasn’t much need...

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