Canada-United States Border

The Canada-United States border is the longest international border in the world. The provinces of British Columbia, Alberta, Saskatchewan, Manitoba, Ontario, Quebec, New Brunswick and the territory Yukon and the states of Alaska, Washington, Idaho, Montana, North Dakota, Minnesota, Michigan, Ohio, Pennsylvania, New York, Vermont, New Hampshire, and Maine border 8.891 km of the border.

History
The border was created on September 3, 1783 with the Treaty of Paris ending the Revolutionary War and creating the United States of America and Great Britain.

The border was in its current shape on April 11, 1908.