The Oregon Treaty was an agreement signed in 1846 between the United States and Great Britain. It settled the boundary dispute over the Oregon Territory, which included present-day Oregon, Washington, and parts of Idaho, Montana, and Wyoming. The treaty established the 49th parallel as the border between British North America and the U.S. west of the Rocky Mountains. This treaty was significant because it helped to avoid potential conflict between the two nations and facilitated the westward expansion of the United States. It also played a crucial role in shaping the future of the Pacific Northwest region.