Era
1951-
35
1792-1865
29
1865-1950
17
Since 1951
14
19th century
12
To 1792
10
20th century
9
1945-1989
7
Since 1865
7
1933-1945
6
1815-1861
5
1861-1865
5
18th century
5
Civil War, 1861-1865
5
1792-1899
4
1800-1899
4
1775-1865
3
1789-1869
3
1865-
3
1909-1992
3
1924-2015
3
Since 1945
3
1797-1801
2
1807-1894
2
1824?-1896
2
1829-1837
2
1849-1877
2
1856-1900
2
1857-1861
2
1896-1970
2
1900-
2
1911-1991
2
1925-1968
2
2017-2021
2
2021-
2
To 1799
2
To 1865
2
1700-1865
1
1787-1863
1
1791
1
1816-1887
1
1865 - 1950
1
1900 - 1999
1
1900-1999
1
1905-
1
1905-1996
1
1923-
1
1941-
1
1945-1953
1
2017-
1
more ...