| Years | Territory | How United States got it |
| 1787-1803 | |
| 1790-1796 | |
| 1798-1817 | |
| 1800-1816 | |
| 1804-1812 | |
| 1805-1837 | |
| 1805-1812 | |
| 1809-1818 | |
| 1812-1821 | |
| 1817-1819 | |
| 1819-1836 | |
| 1822-1845 | |
| 1836-1848 | |
| 1838-1846 | |
| 1848-1859 | |
| 1849-1858 | |
| 1850-1912 | |
| 1850-1896 | |
| 1853-1889 | |
| 1854-1861 | |
| 1854-1867 | |
| 1856-present | |
| 1857-present | |
| 1857-present | |
| 1857-present | |
| 1857-present | |
| 1859-present | |
| | Years | Territory | How United States got it |
| 1861-1876 | |
| 1861-1864 | |
| 1861-1889 | |
| 1863-1912 | |
| 1863-1890 | |
| 1864-1889 | |
| 1867-present | |
| 1867-1959 | |
| 1868-1890 | |
| 1889-1907 | |
| 1898-1959 | |
| 1898-1902 | |
| 1898-1952 | |
| 1898-1946 | |
| 1898-present | |
| 1899-present | |
| 1899-present | |
| 1903-1979 | |
| 1917-present | |
| 1922-present | |
| 1945-1968 | |
| 1947-1978 | |
| 1947-1986 | |
| 1947-1986 | |
| 1947-1994 | |
| 1952-1975 | |
|