Oregon Country was a vast region in the Pacific Northwest of North America, primarily encompassing present-day Oregon, Washington, and parts of Idaho, Montana, and British Columbia. During the early 19th century, it was a contested area claimed by both the United States and Great Britain. The region was known for its rich natural resources, including forests, rivers, and fertile land. The Oregon Trail, a historic route used by settlers, facilitated migration to the area in the 1840s and 1850s. The Oregon Treaty of 1846 ultimately established the boundary between U.S. and British territories, solidifying the United States' claim to the Oregon Country.