Era
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1936-1953
2
1936-1991
1
1938-
2
1939-1945
1
1945-
2
1945-1953
1
1945-1980
1
1945-1989
1
1945-1991
1
1946-1954
1
1951-
1
1953-1985
1
1960-1980
1
1961-1963
2
1961-1969
1
1963-1969
3
1968-1989
1
1969-1974
1
1975-1979
1
1977-1981
1
1980
1
1980-
4
1981-1989
1
1985-
1
1989-
1
1989-1993
1
1990-
1
19th century
4
2001-2009
1
20th century
14
Civil War, 1861-1865
1
Civil War, 1960-1965
1
Civil War, 1983-2005
1
Civil War, 1989-1996
2
Civil War, 1996-2006
1
Confederation, 1783-1789
1
Revolution, 1775-1783
4
Revolution, 1989
1
To 1964
2
Velvet Revolution, 1989
1
d. 1617
1
d. 1769
1