Era
20th century
65
19th century
37
1900-1999
29
1945-1989
17
21st century
16
1800-1899
13
1861-1865
11
1913-1994
9
1969-1974
9
1865-1950
8
1951-
8
Civil War, 1861-1865
8
1989-
7
2000-2099
7
Since 1900
7
1809-1865
6
1946-
6
1961-1963
6
1849-1877
5
1865-1900
5
1953-1961
5
1815-1861
4
1865-1877
4
1963-1969
4
1824-1864
3
1857-1861
3
1858-1919
3
1865-1933
3
1882-1945
3
1909-1913
3
1933-1945
3
1960
3
To 1865
3
1792-1857
2
1853-1857
2
1857-1930
2
1865-1869
2
1865-1918
2
1865-1999
2
1890-1969
2
1912
2
1913-1921
2
1917-1963
2
1968
2
1972
2
1974-1977
2
1976
2
2001-2009
2
2016
2
Since 2000
2
more ...