The Oregon Territory was a region in the Pacific Northwest of the United States, established in 1848. It included present-day Oregon, Washington, and parts of Idaho, Montana, and Wyoming. The territory was significant for its rich natural resources and was a key area for westward expansion during the 19th century. The Oregon Trail, a major route for settlers, led many pioneers to the territory in search of land and opportunity. The territory was officially organized as a U.S. territory, and its establishment helped to resolve disputes with Great Britain over land claims in the region.