Great Britain and the United States almost went to a war between in the 1840s because of a dispute over

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The dispute over the border between the Oregon territory and British Columbia almost led to war between Great Britain and the United States in the 1840s. The two countries had conflicting claims to the territory, with the United States arguing for the border at the 54°40' parallel and Great Britain arguing for a more southerly border. The dispute was eventually resolved with the signing of the Oregon Treaty in 1846, which established the border at the 49th parallel.

Great Britain and the United States Almost Went to a War