Era
Civil War, 1861-1865
75
20th century
67
19th century
31
1900-1999
9
Colonial period, ca. 1600-1775
9
Revolution, 1775-1783
9
1800-1899
7
1843-1916
6
18th century
6
1815-1861
5
War of 1812
5
1865-1898
4
21st century
4
Constitutional period, 1789-1809
4
1800-1999
3
1835-1910
3
1837-1920
3
2000-2099
3
1768-1849
2
1775?-1824
2
1783-1850
2
1787-1824
2
1811-1896
2
1819-1891
2
1849-1877
2
1860-1935
2
1901-1953
2
1930-
2
1944-
2
French and Indian War, 1754-1763
2
1451-1512
1
1700-1899
1
1728-1786
1
1732-1799
1
1743-1826
1
1744-1826?
1
1751-1780
1
1751-1836
1
1754-1763
1
1754-1835
1
1755-1763
1
1783-1865
1
1790-1866
1
1801-1809
1
1804-1864
1
1807-1870
1
1809-1817
1
1813-1890
1
1817-1825
1
1818-1900
1
more ...