Era
19th century
363
20th century
207
1800-1899
101
1860-1890
89
1848-1860
56
1900-1999
54
To 1848
51
Civil War, 1861-1865
49
1890-1945
47
1770-1838
41
1866-1895
37
1774-1809
34
1846-1917
19
1809-1868
13
1909-1993
13
1945-
13
1813-1890
12
1800-1999
11
1835-1910
11
1861-1909
11
21st century
11
1839-1876
10
1865-1918
10
approximately 1775-approximately 1815
10
1861-1865
9
1869-1934
9
Jurassic
9
1815-1875
8
1846-1896
8
1865-1921
8
18th century
8
Cretaceous
8
1834-1902
7
From 140 to 190 million years ago
7
From 65 to 140 million years ago
7
1783-1859
6
1815-1861
6
1862-1865
6
1796-1872
5
1861-1932
5
1872-1939
5
1927-1989
5
1940-2003
5
Paleozoic
5
approximately 1775-1813
5
1743-1826
4
1771-1832
4
1784-1864
4
1788-1824
4
1789-1869
4
more ...