Oregon Question

The "Oregon Question" in North American history primarily refers to the dispute between the United States and Great Britain over the territorial claims to the Oregon Country in the Pacific Northwest. This region, roughly encompassing present-day Oregon, Washington, and Idaho, was inhabited by various Native American groups before European arrival.123

Exploration of the area began with Spanish and English sailors in the 16th century, with Captain James Cook visiting in 1778 and Robert Gray entering the Columbia River in 1792, establishing an early U.S. claim. The Lewis and Clark Expedition further solidified U.S. presence in 1805.2

By the 1840s, American settlers, encouraged by the concept of Manifest Destiny, began migrating to the region via the Oregon Trail. This led to the organization of a provisional government and increasing pressure for U.S. annexation. The dispute was resolved in 1846 with the Oregon Treaty, which established the 49th parallel as the boundary between the U.S. and British North America. Oregon became the 33rd U.S. state in 1859.143