Outline of Washington territorial evolution
Outline of Washington territorial evolution

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

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

An enlargeable map of the United States after the Washington Organic Act in 1853

An enlargeable map of the United States after Washington Statehood in 1889

An enlargeable map of the United States as it has been since 1959
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]
See also
Historical outline of Washington
History of Washington (state)
Territorial evolution of the United States