Era
Civil War, 1861-1865
11
1809-1865
8
20th century
7
19th century
4
1757-1804
3
1862-1932
3
1864-1922
2
1882-1945
2
1927-1993
2
1946-
2
War of 1812
2
1761-1849
1
1782-1862
1
1822-1885
1
1827-1900
1
1831-1881
1
1831-1897
1
1838-1914
1
1857-1930
1
1858-1919
1
1865-1946
1
1874-1964
1
1884-1962
1
1891-1964
1
1908-1973
1
1924-
1
1929
1
21st century
1
Pleistocene
1
Quaternary
1
Revolution, 1775-1783
1
To 1848
1