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Their was altogether two treaties that established the border between the United States and Canada the first was the Treaty of Paris of 1783 which settled the basic border, then the Webster- Ashburton Treaty of 1842 that settled the boundary between Maine and Canada, in 1844 the land dispute of the Oregon Territory was settled with the United Kingdom, Canada being a part of it at the time which established the present border between the state of Washington and Canada. Then the last time it was altered was in 1903 with a tribunal involving the United Kingdom, Canada and the United States, which settled the border between Canada and Alaska. That was the last time the border between the United States and Canada ever changed.

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17y ago

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