What territory did the US gain through an 1846 treaty with Great Britain?

Through the 1846 Oregon Treaty, the United States gained control of the Oregon Territory, which included present-day Oregon, Washington, and parts of Idaho, Montana, and Wyoming. The treaty resolved the boundary dispute between the U.S. and Great Britain along the 49th parallel, establishing the border between the U.S. and British North America (now Canada) in the Pacific Northwest. This agreement was significant in expanding U.S. territory and fulfilling the concept of Manifest Destiny.