U-S-History.com
2005
|
Date
|
Territory
|
Area (square miles)
|
Comment
|
| 1783 | Former colonies | 892,135 | Treaty of Paris of 1783 following military victory |
| 1803 | Louisiana Purchase | 827,987 | Purchased from France for $15 million, including assumed claims |
| 1819 | Florida (East and West) | 72,101 | Purchased from Spain for $5 million in assumed claims under Adams-Onís Treaty |
| 1845 | Texas | 389,166 | Annexation of independent republic |
| 1846 | Oregon Territory | 286,541 | The Oregon Treaty with Great Britain |
| 1848 | Mexican Cession | 529,189 | Purchase from Mexico following military victory; $15 million plus 3.25 million in assumed claims |
| 1853 | Gadsden Purchase | 29,670 | Purchased from Mexico for $10 million |
| 1857 |
Baker Island,Howland Island,Jarvis Island |
.5, .6, 1.7 | Unincorporated territory claimed under Guano Act of 1856 |
| 1858 | Johnston Atoll | 1.1 | Unincorporated territory annexed under Guano Act of 1856; chemical weapon disposal site |
| 1867 | Alaska | 591,000 | Purchased from Russia for $7.2 million; statehood 1959 |
| 1867 | Midway Islands | 2 | Annexation of unoccupied area |
| 1898 | Hawaiian Islands | 6,450 | Annexation of independent republic; statehood 1959 |
| 1898 | Philippine Islands | 115,800 | Purchased from Spain following military victory; independent in 1946 |
| 1898 | Puerto Rico | 3,508 | Annexed following military victory over Spain |
| 1898 | Guam | 209 | Annexed following military victory over Spain |
| 1899 | American Samoa | 76 | Annexed in settlement with Britain and Germany |
| 1899 | Wake Island | 3 | Annexation of unoccupied area |
| 1903 | Panama Canal Zone | 553 | Leased from Panama for $10 million, plus $250,000 annually; ceded to Panama in 1999 |
| 1917 | Virgin Islands | 136 | Purchased from Denmark for $25 million; currently an organized, unincorporated U.S. territory under jurisdiction of Office of Insular Affairs of the Dept. of the Interior |
| 1922 | Kingman Reef | .4 | Annexed 1922; later airline refueling; currently uninhabited; National Wildlife Refuge |
| 1938 | Kanton and Enderbury Islands | 3.5, 3.0 | Joint occupation with Britain; independent as Kiribati in 1979 |
| 1947 | Mariana Islands | 179 | United Nations Trust Territory; self-governing as Northern Mariana Islands |
| 1947 | Caroline Islands | 500 | United Nations Trust Territory; 1986 most islands adopt commonwealth status as Federated States of Micronesia |
| 1947 | Marshall Islands | 70 | United Nations Trust Territory; 1979 self-governing; 1986 independent as Republic of the Marshall Islands |
More Information on US Military Expansion and Intervention
