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
|
1818
|
46,194
|
British Cession
|
Minnesota, North Dakota, South Dakota
|
1819
|
72,101
|
Florida
|
Florida
|
1845
|
389,166
|
Annexation of Texas
|
Texas, New Mexico, Colorado, Oklahoma, Kansas, Wyoming
|
1846
|
286,541
|
Oregon Territory
|
Oregon, Washington, Idaho, Montana, Wyoming
|
1848
|
529,189
|
Mexican Cession
|
California, Nevada, Utah, Wyoming, Colorado, Arizona, New Mexico
|
1854
|
29,670
|
Gadsden Purchase
|
Arizona, New Mexico
|
1867
|
591,000
|
Purchase of Alaska
|
Alaska
|
1898
|
115,800
|
Purchase of Philippine Islands
|
The Philippines
|
1898
|
6,450
|
Annexation of Hawaiian Islands
|
Hawaii
|
1898
|
3,508
|
Puerto Rico
|
Puerto Rico
|
|