Era
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1964-
1
1964-1979
2
1965-1975
1
1967-1973
1
1968
13
1969 - 1974
2
1969-
1
1969-1974
166
1969-1977
2
1970-1973
1
1971-1981
4
1972
9
1972 - 1974
1
1972-1974
1
1973
1
1973-1993
1
1974-1977
20
1977-1981
4
1989-
3
1992
1
20th century
90
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
Vietnam War, 1961-1975
2