Era
Civil War, 1861-1865
12
1945-1989
4
20th century
4
20th century --
4
1970-
3
1989-
3
19th century --
3
1783-1865
2
19th century
2
21st century
2
1775-1783
1
1782-185
1
1791-183
1
1809-18
1
1815-1861
1
1824-186
1
1829-1837
1
1830 or 31-188
1
1842-1874
1
1845-1861
1
1849-1861
1
1850-1950
1
1861-1865
1
1865-1877
1
1891-1937
1
1910-
1
1913-1921
1
1913-1994
1
1918-1945
1
1919-1933
1
1921-
1
1923-1929
1
1941-1979
1
1945
1
1945-
1
1946
1
1946-
1
1950-
1
1960-
1
1961-1963
1
1969-1974
1
1971-
1
1981-1989
1
1985-1995
1
1989-1993
1
1993-2001
1
1997-
1
19th centu
1
19th centu --
1
19th centur --
1
more ...