1818 - The 49th parallel is determined as the border between much of the U.S. and Canada.

In 1818, the 49th parallel was established as the border between much of the United States and Canada.

This was part of the Treaty of 1818, which established peace between the United States and the United Kingdom.

The 49th parallel stretches from the Lake of the Woods in Minnesota to the Rocky Mountains.

The border was created to resolve the Oregon boundary dispute between the two countries.

As part of the treaty, the U.S. and the U.K. agreed to share access to the Oregon Territory.

It also established the Great Lakes as a border between the two countries.

The 49th parallel is the longest international boundary in the world.

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