United States territorial acquisitions table

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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 Republic 17919,61624,905-----
Louisiana Purchase, from France 1803827,9872,144,476$15,000,000 [1]
Florida (East and West), purchased from Spain 181972,101186,740$5,000,000 [2]
Texas annexation 1845389,1661,007,935----- [2]
Oregon Territory, by treaty with Great Britain 1846286,541742,137----- [2]
Mexican Cession, from Mexico 1848529,1891,370,593$15,000,000 [2]
Gadsden Purchase, from Mexico185429,67076,845$10,000,000 [3]
Baker Island, unincorporated territory claimed under Guano Act of 1856 18570.51.29-----
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 Russia 1867591,0001,723,336$7,200,000 [2] [4]
Midway Islands, annexation of unoccupied area186725.18-----
Annexation of the Republic of Hawaii 18986,45016,705----- [2]
Philippines, purchased from Spain (Full independence was granted in July, 1946)1898115,800299,921$20,000,000 [5]
Puerto Rico, by treaty with Spain18983,5089,085-----
Guam, by treaty with Spain1899209541----- [2]
Eastern Samoa, by treaty with Great Britain and Germany 189976197----- [2]
Panama Canal Zone, by treaty with Panama 19035531,432$10,000,000 (plus $250,000 annually) [2]
Guantánamo, by treaty with Cuba 190345116.5$3,386.25 (rent annually) [6]
Annexation of the Indian Territory 190631,06980,468-----
Danish Virgin Islands (excluding Water Island), by purchase from Denmark 1917136352$25,000,000 [2]
Kingman Reef, annexed19220.41.0-----
Swains Island, annexed19250.942.43----- [7]
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)19440.82.0$10,000
Mariana Islands, United Nations Trust Territory; self-governing as Northern Mariana Islands 1947179467-----
Caroline Islands, United Nations Trust Territory; 1986 most islands adopt commonwealth status as Federated States of Micronesia 19475001,295-----
Marshall Islands, United Nations Trust Territory; 1979 self-governing; 1986 independent as Republic of the Marshall Islands 194770181-----

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

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References

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  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 .
  7. Van Tilburg, Hans K.; Herdrich, David J.; Suka, Rhonda; Lawrence, Matthew; Filimoehala, Christopher; Gandulla, Stephanie (September 2013). Unlocking the Secrets of Swains Island: a Maritime Heritage Resources Survey (PDF). Maritime Heritage Program Series: Number 6. Silver Spring, Maryland: National Oceanic and Atmospheric Administration, Office of National Marine Sanctuaries. Retrieved 2024-04-25.