Era
1809-1852
6
20th century
5
1900-1999
4
1913-1995
3
Civil War, 1861-1865
2
1732-1799
1
1776
1
1789-1900
1
1789-1999
1
1803-1831
1
1830-1886
1
1861-1865
1
1864?-1943
1
1871-1918
1
1880-1968
1
1915-2005
1
1930-
1
1930-2004
1
1939-1945
1
1958-
1
1988-
1
19th century
1
2000-2099
1
21st century
1
Eocene
1