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Establishment of Oregon Territory

When: 14 August 1848
Where: Seat of Congress and Executive
Part of: Oregon Territory organized as a United States territory

Congress passed the Act to Establish the Territorial Government of Oregon on August 14, 1848, creating the organized incorporated territory.

The Act officially created the Territory of Oregon, which existed until 1859. President Polk signed the bill in 1848, which established the territorial government and prohibited slavery in the region, following the 1846 treaty that ended joint occupancy.

Sources

Oregon Territory Wikipedia, revision of 2026-08-08
James K. Polk Wikipedia, revision of 2026-10-04
Oregon Treaty Wikipedia, revision of 2026-09-16

Machine-drafted from the cited Wikipedia passages and checked by a reviewing model, not by a human editor. Every passage cites the revision it was written from; dates and places follow those passages.