United States territorial acquisitions table

Following are the historical territorial acquisitions of the United States:

AccessionDateArea (sq.mi.)Area (km2.)Cost in dollars
Original territory of the Thirteen States (western lands, roughly between the Mississippi River and Appalachian Mountains, were claimed but not administered by the states and were all ceded to the federal government or new states by 1802)1783892,1352,310,619-----
Annexation of the Vermont Republic17919,61624,905-----
Louisiana Purchase, from France1803827,9872,144,476$15,000,000[1]
Florida (East and West), purchased from Spain181972,101186,740$5,000,000[2]
Texas annexation1845389,1661,007,935-----[2]
Oregon Territory, by treaty with Great Britain1846286,541742,137-----[2]
Mexican Cession, from Mexico1848529,1891,370,59315,000,000[2]
Gadsden Purchase, from Mexico185429,67076,84510,000,000[3]
Baker Island, unincorporated territory claimed under Guano Act of 185618570.51.29-----
Howland Island, unincorporated territory claimed under Guano Act of 185618570.61.55-----
Jarvis Island, unincorporated territory claimed under Guano Act of 185618571.74.4-----
Johnston Atoll, unincorporated territory claimed under Guano Act of 185618571.12.85-----
Alaska Purchase, from Russia1867591,0001,723,3367,200,000[2][4]
Midway Islands, annexation of unoccupied area186725.18-----
Annexation of the Republic of Hawaii18986,45016,705-----[2]
Philippines, purchased from Spain (Full independence was granted in July, 1946)1898115,800299,92120,000,000[5]
Puerto Rico, by treaty with Spain18983,5089,085-----
Guam, by treaty with Spain1899209541-----[2]
American Samoa, by treaty with Great Britain and Germany189976197-----[2]
Panama Canal Zone, by treaty with Panama19035531,432$10,000,000 (plus $250,000 annually)[2]
Guantanamo, by treaty with Cuba190345116.5$3,386.25 (rent annually) [6]
Annexation of the Indian Territory190731,06980,468-----
Danish Virgin Islands (excluding Water Island), by purchase from Denmark1917136352$25,000,000[2]
Kingman Reef, annexed19220.41.0-----
Kanton Island and Enderbury Island, joint occupation with Britain (Independent as Republic of Kiribati in 1979)19386.516.8-----
Water Island, by purchase from the East Asiatic Company, a private shipping company based in Denmark (which at the time was under German occupation)19440.82.010,000
Mariana Islands, United Nations Trust Territory; self-governing as Northern Mariana Islands1947179467-----
Caroline Islands, United Nations Trust Territory; 1986 most islands adopt commonwealth status as Federated States of Micronesia19475001,295-----
Marshall Islands, United Nations Trust Territory; 1979 self-governing; 1986 independent as Republic of the Marshall Islands194770181-----

Further information: Territorial evolution of the United States

For information on internal territorial acquisitions, see List of U.S.–Native American treaties.

References
  1. "Milestones: 1801–1829 – Office of the Historian". state.gov.
  2. World Atlas. Chicago / New York / San Francisco: Rand McNally. 1972. p. 90.
  3. "Milestones: 1830–1860 – Office of the Historian". state.gov.
  4. "Milestones: 1866–1898 – Office of the Historian". state.gov.
  5. America, The National Atlas of the United States of. "Territorial Acquisitions of the United States". nationalmap.gov.
  6. Rothman, Lily (22 January 2015). "Why the United States Controls Guantanamo Bay". time.com.
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