Outline of Oregon territorial evolution

Legend for maps

  U.S. state

  U.S. territory

  Claimed by other countries

  Disputed

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

Outline edit

An enlargeable map of the United States after the Anglo-American Convention of 1818

An enlargeable map of the United States after the Adams-Onís Treaty took effect in 1821

An enlargeable map of the United States after the Oregon Treaty of 1846

An enlargeable map of the United States after the Oregon Organic Act in 1848

An enlargeable map of the United States after Oregon Statehood in 1859

An enlargeable map of the United States as it has been since 1959

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
Historical 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^[1]
  - 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^[2] (Eastern portion of territory transferred to Territory of Washington)