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Louisiana Purchase and Territorial Organization (1803–1821)
1803 - 1821
15 entries
Indian Removal, Land Cession Treaties, and the Formation of Indian Territory (1815–1907)
1814 - 1907
14 entries
Gadsden Purchase and Southern Railroad Negotiations (1853–1854)
1848 - 1856
12 entries
Annexation of the Republic of Texas and U.S. Integration (1836–1846)
1836 - 1846
13 entries
American Samoa: Treaties, Cession, and Territorial Administration (1899–present)
1899 - 2025
14 entries
Alaska Purchase and Territorial Development (1867–1959)
1867 - 1980
14 entries
Adams–Onís Treaty and the Acquisition of Florida (1819–1821)
1817 - 1822
13 entries
Acquisition and Political Status Changes of Puerto Rico (1898–present)
1898 - 2024
20 entries
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