1846 - The border between the United States and Canada in the west is decided by the Oregon Treaty.

In 1846, the Oregon Treaty was signed, agreeing to the boundary between the United States and Canada in the west.

The treaty was negotiated by Great Britain and the United States with the goal of settling the Oregon boundary dispute.

The border was established at the 49th parallel, stretching from the Rocky Mountains to the Strait of Georgia.

In addition, the treaty recognized Britain's rights to the Vancouver Island, while the United States gained the territory south of the Columbia River.

The Oregon Treaty also established the boundary between the United States and British North America (which later became Canada).

The Oregon Treaty also acknowledged the United States' right to navigate the Columbia River, which was essential for trade and transportation in the region.

The Oregon Treaty was ratified by the United States in 1848 and by Britain in 1849.

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