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 agreement extended the border along the 49th parallel to the Pacific Ocean but kept Vancouver Island within British North America. It was also agreed that British subjects living in the Oregon Territory south of the 49th parallel would retain navigation rights on the Columbia River.

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.

Detailed explanation-4: -In the early 1800s, many Native American nations claimed the Oregon Country. Four countries did also. They were the United States, Great Britain, Spain and Russia. Many Americans wanted to be able to get to the Pacific Ocean.

Detailed explanation-5: -On August 14, 1848, Congress created Oregon Territory, a vast stretch of western America that included all or portions of five present-day states, including Washington.