America and Britain draw the line

8/5/1846

On August 5, 1846, President James K. Polk proclaimed the Treaty with Great Britain, in Regard to Limits Westward of the Rocky Mountains. This treaty resolved the Oregon border dispute by drawing a straight line along the 49th parallel. The line extended the existing boundary between the United States and Britain over the Rocky Mountains to the Pacific Ocean.

National Archives, Records of the Foreign Service Posts of the Department of State


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