Era
20th century
10
19th century
7
1901-1978
3
21st century
3
1794-1858
2
1857-1924
2
1858-1942
2
1940-
2
1945-
2
1961-
2
1798-1877
1
1830-1948
1
1834-1902
1
1844-1921
1
1851-1922
1
1855-1934
1
1872-1956
1
1884-1942
1
1885-1966
1
1893-1953
1
1899-1976
1
18th century
1
1900-1957
1
1901-1978,
1
1906-1991
1
1907-1940
1
1931-
1
1942-
1
1944-
1
1951-
1
1957-
1
1962-
1
1965-1980
1
1979-
1
1985-1991
1
Civil War, 1979-1992
1
Conquest, 1519-1540
1
Partition, 1995
1
To 146 B.C.
1
To 1500
1
To 1791
1
Unification, 1990
1