Outline of Oregon territorial evolution

Overview of and topical guide to 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

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)

^ Thirtieth United States Congress (August 14, 1848). "An Act to establish the Territorial Government of Oregon" (cgi-bin). Retrieved June 5, 2009.
^ Thirty-fifth United States Congress (February 14, 1859). "An Act for the Admission of Oregon into the Union" (cgi-bin). Retrieved June 5, 2009.

State of Oregon website
- Oregon Blue Book: Oregon History
- Oregon Historical Society
  - Oregon History Project

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Western	Northwest Oregon Oregon Coast Portland Metro Tualatin Valley Willamette Valley
Eastern	Harney Basin High Desert Palouse Treasure Valley Central Oregon
Southern	Rogue Valley
Shared	The Cascades Columbia Gorge Columbia River Columbia Plateau Great Basin Mount Hood Corridor Trout Creek Mountains

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