Era
1860
41
1856
28
1861
23
1850
22
1857-1861
19
1862
16
1851
14
1859
14
1836
13
1855
13
1853-1857
11
1854
11
1837
10
1839
10
1845
10
1854-1861
10
1863
10
1847
9
1857
8
1858
8
1852
7
19th century
7
1861-1865
6
Civil War, 1861-1865
6
1775-1865
5
1780-1842
5
1792-1868
5
1833
5
1838
5
1840
5
1845-1849
5
1846
5
1848
5
1804-1876
4
1841
4
1853
4
1864
4
John Brown's Raid, 1859
4
1624-1691
3
1639?-1716
3
1688-1772
3
1773
3
1777-1852
3
1782-1852
3
1824
3
1832
3
1842
3
1846-1850
3
1849-1853
3
1849-1861
3
more ...