Provisional Government of Oregon

The Provisional Government of Oregon was a popularly elected settler government created in the Oregon Country (1818–1846), in the Pacific Northwest region of the western portion of the continent of North America. Its formation had been advanced at the Champoeg Meetings since February 17, 1841, and it existed from May 2, 1843 until March 3, 1849, and provided a legal system and a common defense amongst the mostly American pioneers settling an area then inhabited by the many Indigenous Nations.

Source: Wikipedia — Provisional Government of Oregon (CC BY-SA 4.0)