Outline of Washington territorial evolution

Updated on Dec 13, 2023

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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

State of Washington since 1889

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