Territorial evolution of Idaho
The following chronology traces the territorial evolution of the U.S. State of Idaho.
Timeline
- Historical territorial claims of Spain in the present State of Idaho:
- *Gran Cuenca, 1776–1821
- *Adams-Onis Treaty of 1819
- Historical international territory in the present State of Idaho:
- *Oregon Country, 1818–1846
- **Anglo-American Convention of 1818
- **Provisional Government of Oregon, 1843–1849
- **Oregon Treaty of 1846
- Historical political divisions of the United States in the present State of Idaho:
- *Unorganized territory created by the Oregon Treaty, 1846–1848
- *Territory of Oregon, 1848–1859
- *State of Deseret, 1849–1850
- *Territory of Washington, 1853–1889
- *Territory of Idaho, 1863-1890
- *State of Idaho since 1890