Era
20th century
506
To 1859
415
19th century
354
1900-1999
164
21st century
142
1802-1847
88
1859-1950
72
1800-1899
62
1900 - 1999
62
2000-2099
59
Tertiary
59
1789-1869
52
Miocene
47
1951-
46
1784-1857
42
Oligocene
42
Civil War, 1861-1865
41
1859-
40
1800 - 1899
37
Eocene
36
1803-1845
33
Cenozoic
32
1815-1875
26
From 2 to 65 million years ago
26
1808-1847
23
1881-1956
21
2010
21
2012
21
From 10 to 25 million years ago
21
To 1846
20
1931-1990
17
1980
17
2009
17
1937-
16
20e siècle
16
Jurassic
16
1939-1945
15
Cretaceous
15
From 65 million years ago
15
Since 1951
15
1763-1848
14
1806-1879
14
1861-1865
14
2000 - 2099
14
Since 1859
14
1803-1874
13
1805-1877
13
19e siècle
13
2008
13
21e siècle
13
more ...