Era
20th century
55
19th century
30
1900-1999
24
17th century
8
21st century
7
Civil War, 1861-1865
7
18th century
6
1800-1899
5
1865-1950
5
1929
5
1900 - 1999
4
1807-1877
3
1865-1933
3
1939 June 9-
3
1945-
3
1980-
3
Colonial period, ca. 1600-1775
3
Revolution, 1775-1783
3
16th century
2
1800-1950
2
1861-1865
2
1865-1900
2
1865-1918
2
1865-1945
2
1881-1954
2
1900-2099
2
1914-
2
1924-
2
1981-2001
2
To 500
2
1500-1599
1
1600-1799
1
1649-1775
1
1700-1799
1
1732-1799
1
1738-1789
1
1762-1851
1
1775 - 1899
1
1775-1865
1
1775-1950
1
1785-1867
1
1788-1839
1
1788-1872
1
1800 - 1899
1
1800-1918
1
1808-1871
1
1811-1872
1
1824-1875
1
1826-1906
1
1830-1921
1
more ...