Era
20th century
10
1945-
6
1933-1945
3
1945-1953
3
19th century
3
21st century
3
1861-1865
2
1945-1989
2
2001-
2
Civil War, 1861-1865
2
1760-1789
1
1789-1815
1
1789-1820
1
1837-1901
1
1858-1919
1
1871-1918
1
1889-1945
1
18th century
1
1901-1909
1
1910-1936
1
1936-1945
1
1945-1949
1
1975-1985
1
1979-1997
1
1981-1989
1
1997-
1
2000-
1
2001-2009
1
2002-
1
2009-
1
Revolution, 1775-1783
1
Revolution, 1789-1799
1