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Statehood of the Great Plains and Mountain States (1861–1912)
1861 - 1912
18 entries
Oregon Treaty and Settlement of the Pacific Northwest (1846–1859)
1843 - 1859
12 entries
Mexican Cession and Incorporation of the Southwest (1846–1853)
1846 - 1854
15 entries
Louisiana Purchase and Territorial Organization (1803–1812)
1803 - 1812
13 entries
Gadsden Purchase and Southern Territorial Adjustments (1853–1854)
1853 - 1912
12 entries
Annexation of the Republic of Texas and Texas Statehood (1836–1846)
1836 - 1846
14 entries