Era
20th century
29
Revolution, 1775-1783
21
Colonial period, ca. 1600-1775
17
Civil War, 1861-1865
15
19th century
13
18th century
8
1933-1945
8
1775-1783
7
1945-1953
6
1945-1989
6
To 1775
5
1783-1815
4
1809-1865
4
To 1863
4
1783-1809
3
1783-1865
3
1815-1861
3
1882-1945
3
1884-1962
3
1945-
3
1961-1963
3
1963-1969
3
To 1865
3
17th century
2
1849-1877
2
1861-1865
2
1865-1898
2
1865-1918
2
1865-1921
2
1865-1933
2
1865-1950
2
1884-1972
2
1917-1963
2
1924-
2
1933-1953
2
1946-
2
1953-1961
2
1961-1969
2
1974-1977
2
-1691
1
-1942
1
1591-1643
1
1600-1750
1
1637-1714
1
1706-1790
1
1728-1814
1
1732-1799
1
1733?-1790
1
1735-1826
1
1743-1826
1
more ...