USA HISTORY

Detailed explanation-1: -The Convention of 1818 set the western boundary between the United States and British North America (later Canada) at the forty-ninth parallel up to the Rocky Mountains. Both agreements reflected the easing of diplomatic tensions that had led to the War of 1812 and marked the beginning of Anglo-American cooperation.

Detailed explanation-2: -The Oregon Territory stretched from the Pacific coast to the Rocky Mountains, encompassing the area including present-day Oregon, Washington, and most of British Columbia. Originally Spain, Great Britain, Russia, and the United States claimed the territory.

Detailed explanation-3: -The United States and Great Britain signed the Treaty of Oregon on June 15, 1846, ending 28 years of joint occupancy of the Pacific Northwest. The treaty established the 49th parallel as the border between the two countries.