Era
20th century
19th century
11
21st century
10
1975-1982
4
Civil War, 1936-1939
3
1883-1955
2
1899-1986
2
1931-1939
2
1975-
2
1861-1941
1
1879-1949
1
1886-1931
1
1886-1939
1
1892-1975
1
1902-1990
1
1902-1999
1
1903-1969
1
1920-2006
1
1923-1930
1
1927-
1
1938-
1
1939-
1
1939-1975
1
1943-
1
1952-1999
1
1967-
1
1971-
1
21th century
1
Revolution, 1917-1921
1
Revolution, 1934
1