Outline of Oregon territorial evolution

Updated on Dec 21, 2023

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The following outline traces the territorial evolution of the U.S. state of Oregon.

Outline

Historical territorial claims of Spain in the present state of Oregon:

Nueva California, 1768–1804

Gran Cuenca, 1776–1821

Alta California, 1804–1821

Adams-Onis Treaty of 1819

Historical international territory in the present state of Oregon:

Oregon Country, 1818–1846

Anglo-American Convention of 1818

Provisional Government of Oregon (extralegal), 1843–1849

Oregon Treaty of 1846

Historial political divisions of the United States in the present state of Oregon:

Unorganized territory created by the Oregon Treaty, 1846–1848

Territory of Oregon, 1848–1859

Oregon Organic Act, August 14, 1848

Northern portion of Oregon Territory incorporated in new Washington Territory, March 2, 1853

State of Deseret (extralegal), 1849–1850

State of Oregon since 1859

Oregon Statehood Act, February 14, 1859 (Eastern portion of territory transferred to Territory of Washington)

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