The Rush-Bagot Pact was an agreement between the United States and Great Britain to eliminate their fleets from the Great Lakes, excepting small patrol vessels. The Convention of 1818 set the boundary between the Missouri Territory in the United States and British North America (later Canada) at the forty-ninth parallel. Both agreements reflected the easing of diplomatic tensions that had led to the War of 1812 and marked the beginning of Anglo-American cooperation.
U.S. political leaders had long expressed interest in disarming the Great Lakes and had proposed such a measure during negotiations that led to the 1794 Jay Treaty, but British officials had rejected this proposal. During the War of 1812, both Great Britain and the United States had built fleets of ships on lakes Erie and Ontario, and fought many battles in the region. Near the end of the war, U.S. forces had achieved dominance over the Lakes.