The Oregon Country was a predominantly American term referring to a disputed ownership region of the Pacific Northwest of North America. The region was occupied by British and French Canadian fur traders from before 1810, and American settlers from the mid-1830s, with its coastal areas north from the Columbia River frequented by ships from all nations engaged in the maritime fur trade, most of these from the 1790s through 1810s being Boston-based. The Oregon Treaty of 1846 ended disputed joint occupancy pursuant to the Treaty of 1818 and established the British-American boundary at the 49th parallel.

Oregon was a distinctly American term for the region. The British used the term Columbia District instead. The Oregon Country consisted of the land north of 42°N latitude, south of 54°40′N latitude, and west of the Rocky Mountains to the Pacific Ocean. The area now forms part of the present day Canadian province of British Columbia, all of the US states of Oregon, Washington, and Idaho, and parts of Montana and Wyoming. The British presence in the region was generally administered by the Hudson's Bay Company, whose Columbia Department comprised most of the Oregon Country and extended considerably north into New Caledonia and beyond 54°40′N, with operations reaching tributaries of the Yukon River.

Oregon (ⁱ/ˈɔrɨɡən/ ORR-ə-gən) is a state in the Pacific Northwest region of the United States. It is located on the Pacific coast, with Washington to the north, California to the south, Nevada on the southeast and Idaho to the east. The Columbia and Snake rivers delineate much of Oregon's northern and eastern boundaries, respectively. The area was inhabited by many indigenous tribes before the arrival of traders, explorers, and settlers who formed an autonomous government in Oregon Country in 1843. The Oregon Territory was created in 1848, and Oregon became the 33rd state on February 14, 1859.

Oregon is the 9th most extensive and the 27th most populous of the 50 United States. Salem is the state's capital and third-most-populous city; Portland is the most populous. Portland is the 29th-largest U.S. city, with a population of 583,776 (2010 US Census) and a metro population of 2,241,841 (2009 estimate), the 23rd-largest U.S. metro area. The valley of the Willamette River in western Oregon is the state's most densely populated area and is home to eight of the ten most populous cities.