Era
1775-1783
39
Revolution, 1775-1783
27
1783-1809
25
19th century
23
1775-1865
21
1815-1861
20
Civil War, 1861-1865
19
1861-1865
15
1809-1865
13
1757-1804
11
1865-1950
11
1783-1865
10
1933-1945
10
To 1775
10
1767-1845
9
1791-1868
9
18th century
9
20th century
9
1735-1826
8
1857-1861
8
1865-1900
8
1732-1799
7
1743-1826
7
1783-1789
7
1706-1790
6
1945-1953
6
1783-1815
5
1789-1797
5
1792-1864
5
1849-1877
5
To 1865
5
1756-1836
4
1829-1837
4
1829-1906
4
1865-1933
4
1989-
4
Colonial period, ca. 1600-1775
4
Constitutional period, 1789-1809
4
1732-1808
3
1742-1798
3
1746-1813
3
1751-1836
3
1775-1783, Revolution
3
1810-1883
3
1843-1901
3
1845-1861
3
1853-1857
3
1884-1972
3
1898-1951
3
1913-1921
3
more ...