Date
|
Area
|
Territorial Acquisition
|
Includes
|
1783
|
892,135
|
Thirteen States
|
Delaware, Pennsylvania, New Jersey, Georgia, Connecticut, Massachusetts, Maryland, South Carolina, New Hampshire, Virginia, New York, North Carolina, Rhode Island, Vermont, Kentucky, Tennessee, Ohio, Indiana, Mississippi, Illinois, Alabama, Maine, Michigan, Wisconsin, Minnesota, West Virginia
|
1803
|
827,987
|
Louisiana Purchase
|
Louisiana, Arkansas, Missouri, Iowa, Minnesota, Oklahoma, Kansas, Nebraska, South Dakota, North Dakota, Colorado, Wyoming, Montana, Florida
|
1867
|
591,000
|
Purchase of Alaska
|
Alaska
|
1848
|
529,189
|
Mexican Cession
|
California, Nevada, Utah, Wyoming, Colorado, Arizona, New Mexico
|
1845
|
389,166
|
Annexation of Texas
|
Texas, New Mexico, Colorado, Oklahoma, Kansas, Wyoming
|
1846
|
286,541
|
Oregon Territory
|
Oregon, Washington, Idaho, Montana, Wyoming
|
1898
|
115,800
|
Purchase of Philippine Islands
|
The Philippines
|
1819
|
72,101
|
Florida
|
Florida
|
1818
|
46,194
|
British Cession
|
Minnesota, North Dakota, South Dakota
|
1854
|
29,670
|
Gadsden Purchase
|
Arizona, New Mexico
|
1898
|
6,450
|
Annexation of Hawaiian Islands
|
Hawaii
|
1898
|
3,508
|
Puerto Rico
|
Puerto Rico
|
|