Era
20th century
12
19th century
9
1900-1999
6
1933-1945
6
1800-1899
4
1918-1945
4
1884-1962
3
1929
3
Civil War, 1861-1865
3
To 1865
3
1600-1714
2
1660-1714
2
1775-1783
2
1775-1865
2
1783-1865
2
17th century
2
1815-1861
2
1861-1865
2
1882-1945
2
1883-1954
2
1918-1932
2
1918-1933
2
1919-1933
2
1945-1989
2
-1589
1
1172-1603
1
1558-1603
1
16th century
1
1775-1817
1
1800 - 1899
1
1803-1865
1
1837-1901
1
1865-1877
1
1865-1950
1
1867-1918
1
1878-1918
1
1894-1984
1
1913-1994
1
1913-2006
1
1917-1936
1
1917-1945
1
1921-1923
1
1923-
1
1923-1929
1
1929-1933
1
1945-
1
1945-1955
1
1969-1974
1
1974-1977
1
987-1328
1
more ...