Era
1775-1783
12
20th century
10
Revolution, 1775-1783
8
1783-1809
5
1809-1865
4
Civil War, 1861-1865
4
1783-1789
3
1861-1865
3
1933-1945
3
1945-
3
1945-1989
3
2001-2009
3
21st century
3
To 1775
3
1732-1799
2
1757-1804
2
1760-1789
2
1865-1900
2
1869-1948
2
1889-1945
2
18th century
2
1900-1999
2
1919-1947
2
1945-1953
2
1969-1974
2
1985-1991
2
Colonial period, ca. 1600-1775
2
1644-1912
1
1736-1799
1
1743-1826
1
1767-1848
1
1783-1865
1
1815-1861
1
1849-1861
1
1857-1930
1
1861 - 1865
1
1861-1943
1
1863-1877
1
1865-1877
1
1865-1898
1
1884-1962
1
1884-1972
1
1900 - 1999
1
1900 - 2099
1
1901-1909
1
1908-1973
1
1909-1913
1
1912-2007
1
1913-1921
1
1913-1994
1
more ...