Era
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1837-1901
25
1883-1950
25
1888-1918
25
1900 - 1999
25
1964-
25
1966-
25
1982-1994
25
1984-
25
To 1800
25
1564-1616
24
1815-1861
24
1928-1932
24
1939-1945
24
1964-1985
24
Since 1981
24
To 500
24
1917-
23
1918-1952
23
1924-
23
1963-1969
23
1977-
23
2007-
23
Qing dynasty, 1644-1912
23
1789-1900
22
1865-
22
1933-
22
1962-
22
Civil War, 2011-
22
To 1789
22
1772-1823
21
1917-1936
21
1857-1929
20
1945-1955
20
1955-
20
1970-1982
20
1972-
20
Early modern and Elizabethan, 1500-1600
20
1868-
19
1926-
19
1945-1980
19
1953-1985
19
1964-1975
19
1999-
19
Ottoman Empire, 1288-1918
19
1945-1953
18
1945-1979
18
1945-1991
18
1965-
18
Since 1988
18
Since 2001
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