Which country did the United States acquire Oregon from?

The United States acquired Oregon through negotiations and agreements with Great Britain, which concluded with the Oregon Treaty in 1846. This treaty established the boundary between British North America (now Canada) and the United States, effectively granting control of the Oregon Territory to the U.S. The process involved resolving competing claims over the territory that was jointly occupied by both nations under the terms of the Oregon Agreement of 1818. As a result, the acquisition of Oregon is directly linked to diplomatic efforts and conflict resolution with Great Britain, marking a significant expansion of U.S. territory in the 19th century.