Era
20th century
20
1775-1865
18
19th century
16
Civil War, 1861-1865
13
1865-
6
1951-
6
1865-1951
4
1918-
3
1970-
3
1865-1945
2
1865-1950
2
1775 - 1865
1
1820-1867
1
1838-1918
1
1849-1861
1
1853-1922
1
1861-1865
1
1864-1946
1
1882-1945
1
1884-1972
1
1897-1962
1
18th century
1
1900-1941
1
1900-1949
1
1908-1973
1
1920-
1
1924-
1
1929-1968
1
1932-
1
1941-
1
1945-
1
1989-
1
Colonial period, ca. 1600-1775
1
To 1865
1