Era
20th century
45
21st century
21
19th century
18
1900-1999
13
1945-
13
Since 1945
10
1900 - 1999
7
2000-2099
6
1986-
5
Since 1950
5
1800-1899
4
18th century
4
1939-1945
4
1950-1973
4
17th century
3
1800 - 1899
3
1800-1999
3
1863-1931
3
1865-
3
1950-
3
1959-1990
3
1960-1980
3
1991-
3
1994-
3
Civil War, 1876-1877
3
Revolution, 1952
3
Since 1952
3
1564-1616
2
1600-1681
2
1600-1868
2
1776-1831
2
1800 - 1999
2
1808-1884
2
1817-1903
2
1824-1896
2
1860-1904
2
1863-1925
2
1865-1898
2
1886-1960
2
1897-1975
2
1934-
2
1939 - 1945
2
1941-1955
2
1945-1991
2
1946-1986
2
1949-
2
1949-1976
2
1953-1961
2
1959-
2
1961-
2
more ...