Era
20th century
20
21st century
9
1960-
8
2001-
6
1945-
5
1991-
5
1975-
4
1989-
4
1979-
3
1988-
3
1993-
3
1994-
3
1946-
2
1948-
2
1970-
2
1980-
2
19th century
2
2002-
2
1766-1834
1
1818-1883
1
1917-1948
1
1933-
1
1937-1979
1
1945-1989
1
1947-
1
1953-1975
1
1959-
1
1959-1990
1
1961-
1
1961-1978
1
1966-
1
1968-1998
1
1969-
1
1973-
1
1973-1988
1
1975-1977
1
1976-2002
1
1977-
1
1978-
1
1982-
1
1991-2003
1
1993
1
1995-2005
1
1997-
1
1998-
1
20th Century
1
Civil War, 1970-1975
1
Civil War, 1975-
1
Revolution, 1959
1
South African Incursions, 1978-1990
1