Era
Civil War, 1861-1865
15
Revolution, 1775-1783
9
19th century
6
Colonial period, ca. 1600-1775
6
1683-1852
4
1850
4
War of 1812
3
1783-1815
2
1820-1888
2
1827-1902
2
1836-1918
2
18th century
2
Census, 2nd, 1800
2
1700-1899
1
1737-1832
1
1749-1832
1
1750-1806
1
1751-1836
1
1753-1820
1
1760-1833
1
1761-1849
1
1768-1854
1
1775-1865
1
1783-1865
1
1789-1862
1
1800-1874
1
1802-1896
1
1803-1878
1
1815-1861
1
1815-1903
1
1818-1894
1
1820-1910
1
1826-1901
1
1827-1886
1
1827-1911
1
1828-1885
1
1828-1897
1
1833-1871
1
1837-1880
1
1840-1921
1
1840-1928
1
1841-1899
1
1849-1877
1
1850-1935
1
1860-1934
1
1863-1950
1
1865-
1
1873-
1
1875-1948
1
1880-1970
1
more ...