Outline of Washington territorial evolution

Overview of and topical guide to Washington territorial evolution

The following outline traces the territorial evolution of the U.S. State of Washington.

Outline

Historical international territory in the present State of Washington:
- 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 Washington:
- Unorganized territory created by the Oregon Treaty, 1846-1848
- Territory of Oregon, 1848-1859
- Territory of Washington, 1853-1889^[1]
- State of Washington since 1889^[2]

^ Thirty-second United States Congress (March 2, 1853). "An Act to establish the Territorial Government of Washington" (cgi-bin). Retrieved June 5, 2009.
^ Benjamin Harrison (November 11, 1889). "By the President of the United States of America, A Proclamation Admitting the State of Washington to the Union". Retrieved June 5, 2009.

State of Washington website
- Washington Secretary of State History website
- Washington Historical Society
Washington State History

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Western	Kitsap Peninsula Long Beach Peninsula Olympic Peninsula Puget Sound San Juan Islands Skagit Valley
Eastern/Inland	Central Washington Columbia Plateau Methow Valley Okanogan Country Palouse Yakima Valley
Shared	Cascade Range Columbia Gorge Columbia River

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