United States Territorial Acquisitions on a Map

Based on the map, name the land that the United States acquired or re-acquired to build its current territory. This includes land sold to the United States from foreign nations and land annexed from other countries, including countries that separated from the US itself. Some land was annexed before the annexation was recognized. In these circumstances, the treaty supersedes the annexation.
Excluding any land lost/ceded to another country
Excluding smaller territories (Guam, American Samoa, Palmyra Atoll, etc.)
Name the territory name or purchase/treaty name (if there are multiple territories in a single treaty, name any)
All land acquired in a single treaty is listed as a single answer, with two exceptions
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OvenBobat
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Last updated: June 5, 2026
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First submittedJune 5, 2026
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Year
Admission Method
Territory/Treaty
1607–1732
Various charters and conquests
Thirteen Colonies
1783
Treaty recognizing USA/ending war
Western Territory | Treaty of Paris
1791
Congressional act
Vermont | Vermont Admission Act
1803
Treaty purchasing land
Louisiana Territory | Louisiana Purchase
1818
Treaty defining border
British Cession | Treaty of 1818
1819
Treaty trading land/defining border
West Florida + 2 | Adams-Onís Treaty
1819
Treaty trading land/defining border
Florida | Adams-Onís Treaty
1842
Treaty defining border
Aroostook Region + 1 | Webster-Ashburton Treaty
Year
Admission Method
Territory/Treaty
1845
Joint resolution of Congress
Texas | Joint Resolution for Annexing Texas
1846
Treaty defining border
Oregon Territory | Oregon Treaty
1848
Treaty ending war
Mexican Cession | Treaty of Guadalupe Hidalgo
1853–54
Treaty purchasing land
Gadsden Purchase
1867
Treaty purchasing land
Alaska | Alaska Purchase
1898
Treaty ending war
Puerto Rico | Treaty of Paris
1898
Joint resolution of Congress
Hawaii | Newlands Resolution
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