Outline of 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
 * State of Washington since 1889