USA HISTORY

Detailed explanation-1: -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-2: -The Expedition also established an American claim to the Oregon Country that added to Robert Gray’s 1792 chart of the Columbia River when the United States and Great Britain negotiated over control of the Pacific Northwest in 1846.

Detailed explanation-3: -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.

Detailed explanation-4: -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-5: -The Western Frontier was the last great place to be settled by the U.S., and U.S. Citizens wanted that land to be theirs. The land was optimal for farming and had plenty of space to spread out from the over populated cities. U.S. Congressional Map on states that had formed from the Oregon Treaty.