Era
20th century
223
1900-1999
93
19th century
89
Civil War, 1861-1865
61
1819-1950
31
1865-1950
28
1800-1899
26
1951-
23
1913-2005
18
1929-1968
18
To 1819
16
1861-1865
15
To 1865
11
1775-1865
10
1919-1998
10
1925-1965
9
18th century
6
1900 - 1999
6
1961-1970
6
Since 1900
6
1800-1999
5
1897-1973
5
1899-1975
5
1931
5
Cretaceous
5
1886-1971
4
1901-
4
1909-1955
4
1917-1963
4
1918-1999
4
1929
4
1936-
4
From 65 to 140 million years ago
4
To 1950
4
1800 - 1899
3
1805-
3
1807-1877
3
1818-1883
3
1833-1921
3
1865-1898
3
1877-1964
3
1903-1975
3
1907-
3
1918-
3
1922-
3
1924-1984
3
1950-
3
1961-1969
3
1971-1980
3
21st century
3
more ...