Era
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Revolution, 1910-1920
32
1868-1912
31
1901-1936
31
1971-
31
Since 1980
31
1789-1815
30
1890-1970
30
1929-1933
30
Since 1949
30
1964-1979
29
1700-1799
28
1878-1953
28
1921-1923
28
1923-1929
28
War of 1812
28
1801-1809
27
1931-
27
1955-1965
27
1977-
27
1979-1990
26
Since 1990
26
1600-1649
25
1769-1821
25
1858-1919
25
1789-1809
24
1894-1917
24
1901-1910
24
1948-1980
24
1962-
24
1965-
24
1985-1995
24
Since 1997
24
1789-1820
23
1870-1940
23
1918-
23
1939-1975
23
1947-1984
23
1967-1973
23
1970-
23
Ottoman Empire, 1288-1918
23
Revolution, 1959
23
1865-1933
22
1894-1971
22
1954-
22
1958-1969
22
1993-2007
22
Allied intervention, 1918-1920
22
1638-1715
21
1922-1945
21
Stuarts, 1603-1714
21
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