Era
1917-1963
232
20th century
149
1961-1963
82
1945-1989
66
1900-1999
56
1989-
39
1963-1969
21
1908-1973
20
1933-1945
17
Since 1900
16
1961-1969
15
1945-
13
1960-1999
13
21st century
13
Since 1945
13
1953-1961
10
1925-1968
9
1929-1968
8
1960-1980
8
1890-1969
7
1913-1994
7
1960
7
19th century
7
1894-1971
6
1951-
6
1961-1971
5
1981-1989
5
1775-1783
4
1929-1994
4
1961-1975
4
1882-1945
3
1900 - 1999
3
1900-2099
3
1918-1945
3
1921-1992
3
1949-1976
3
1962
3
1966-1999
3
Civil War, 1861-1865
3
Since 1933
3
1735-1826
2
1743-1826
2
1793-1863
2
1808-1875
2
1848-
2
1875-1939
2
1878-1971
2
1888-1969
2
1890-1970
2
1911-1978
2
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