Era
20th century
98
19th century
48
21st century
38
1946-
37
1900-1999
35
1945-1989
35
1989-
26
1951-
21
1800-1899
17
2001-2009
17
1861-1865
14
2000-2099
14
Civil War, 1861-1865
12
1865-1950
11
1809-1865
10
2009-2017
10
2016
10
1913-1994
9
1969-1974
9
Since 1900
9
1865-1877
8
1953-1961
8
1961-1963
8
2017-2021
8
1849-1877
7
1857-1861
7
1963-1969
7
1993-2001
7
2020
7
1981-1989
6
2021-
6
Since 1951
6
1865-1900
5
1900-2099
5
1933-1945
5
2017-
5
1815-1861
4
1865-
4
1882-1945
4
1909-1913
4
1959-
4
1974-1977
4
1993-
4
Since 1989
4
Since 2009
4
To 1933
4
1792-1857
3
1812-1875
3
1824-1864
3
1853-1857
3
more ...