USA HISTORY

Detailed explanation-1: -Originally claimed by several countries (see Oregon Country), the region was divided between the UK and the US in 1846. When established, the territory encompassed an area that included the current states of Oregon, Washington, and Idaho, as well as parts of Wyoming and Montana.

Detailed explanation-2: -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-3: -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.

Detailed explanation-4: -Oregon (/ˈɒrɪɡən/ ( listen)) is a state in the Pacific Northwest region of the United States. Oregon is a part of the Western United States, with the Columbia River delineating much of Oregon’s northern boundary with Washington, while the Snake River delineates much of its eastern boundary with Idaho.

Detailed explanation-5: -The western portion of future Montana then became the easternmost portion of Oregon Territory from 1848 until 1853 and of Washington Territory from 1853 until 1863.