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 (extralegal), 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 (extralegal), 1849–1850
 * Territory of Washington, 1853–1889
 * Territory of Idaho, 1863-1890
 * State of Idaho since 1890