USA HISTORY

Detailed explanation-1: -Both Britain and the US claimed everything west of the continental divide from as far north as Russian Alaska to as far south as Mexico (which at that time included most of present-day California). This area was called the Oregon Territory by the Americans and the Columbia region by the British.

Detailed explanation-2: -The Oregon Territory, 1846 Originally Spain, Great Britain, Russia, and the United States claimed the territory. In 1819, under terms of the Transcontinental Treaty, Spain ceded its claims to the territory to the United States.

Detailed explanation-3: -the us based its claims on oregon through its many missionaries for native americans in the area. settlers sought the rich soil of the river valleys in oregon. polk wanted to acquire california for the us; his slogan was “fifty four forty or fight", which gained him many votes.

Detailed explanation-4: -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.

Detailed explanation-5: -On August 14, 1848 the United States congress approved the formation of the Oregon Territory. At the time the Oregon Territory included all of the present day states of Oregon, Washington, Idaho, and parts of Montana and Wyoming. Its capital city was located in Oregon City, not far from Portland.