Era
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1940-
1
1941-
1
1945-1980
1
1945-1990
1
1948-
1
1949-
1
1951-
1
1960-1980
1
1960-1981
1
1961 - 1975
1
1961-1974
1
1961-1981
1
1964-
1
1965-1975
1
1967-1973
1
1969-
1
1970-1973
1
1972 - 1974
1
1972-1974
1
1973
1
1973-1993
1
1992
1
21st century
1
Civil War, 1970-1975
1
Civil War, 1975-1990
1
Coup d'état, 1973
1
Revolution, 1979
1
Since 1900
1
Since 1945
1
Since 1969
1
United States
1