Era
19th century
11
1815-1861
6
From 10 thousand years ago
5
Holocene
5
Quaternary
5
20th century
4
Cenozoic
4
1800-1899
3
2011
3
From 65 million years ago
3
1500-1700
2
16th century
2
17th century
2
1849-1861
2
1849-1877
2
1900-1999
2
Cretaceous
2
Early modern, 1500-1700
2
1743-1826
1
1782-1862
1
1800-1999
1
1806-1873
1
1807-1886
1
1811-1874
1
1845-1849
1
1845-1861
1
1848
1
1865-1950
1
1883-1963
1
1896-1956
1
1901-1982
1
1980
1
1989
1
2005
1
Civil War, 1861-1865
1
From 10 thousand to 2 million years ago
1
From 2 million years ago
1
From 405 to 425 million years ago
1
From 65 to 140 million years ago
1
Pleistocene
1
Silurian
1