Territorial evolution of Montana

The following chronology traces the territorial evolution of the U.S. State of Montana.

Timeline

 * Historical territorial claims of the United Kingdom in the present State of Montana:
 * Rupert's Land, 1670–1870
 * Anglo-American Convention of 1818
 * Historical territorial claims of France in the present State of Montana:
 * Louisiane, 1682–1764
 * Treaty of Fontainebleau of 1762
 * Historical territorial claims of Spain in the present State of Montana:
 * Luisiana, 1764–1803
 * Third Treaty of San Ildefonso of 1800
 * Historical territorial claims of France in the present State of Montana:
 * Louisiane, 1803
 * Vente de la Louisiane of 1803
 * Historical international territory in the present State of Montana:
 * Oregon Country, 1818–1846
 * Provisional Government of Oregon (extralegal), 1843–1849
 * Oregon Treaty of 1846
 * Historical political divisions of the United States in the present State of Montana:
 * Unorganized territory created by the Louisiana Purchase, 1803–1804
 * District of Louisiana, 1804–1805
 * Territory of Louisiana, 1805–1812
 * Territory of Missouri, 1812–1821
 * Unorganized territory previously the northwestern portion of the Missouri Territory, 1821–1854
 * Unorganized territory created by the Oregon Treaty, 1846–1848
 * Territory of Oregon, 1848–1859
 * Territory of Nebraska, 1854–1867
 * Territory of Washington, 1853–1889
 * Territory of Dakota, 1861–1889
 * Territory of Idaho, 1863–1890
 * Territory of Montana, 1864-1889
 * State of Montana since November 8, 1889