Era
20th century
8
1818-1883
6
1975-
3
21st century
3
1760-1797
1
1804-1872
1
1847-1922
1
1850-1925
1
1850-1932
1
1869-1946
1
1870-1924
1
1870-1940
1
1880-1962
1
1883-1962
1
1886-1959
1
1891-1937
1
1898-1979
1
18th century
1
1920-1970
1
1937-1992
1
1970-1973
1
1980-
1
1982-
1
1984-
1
19th century
1
Civil War, 1936-1939
1
Revolution, 1789-1799
1