Era
20th century
23
1775-1865
18
1809-1865
18
2008
16
1951-
15
1964-
14
1743-1826
13
1775 - 1865
13
1919-1998
13
21st century
13
1767-1848
11
1831-1881
11
1858-1919
11
1732-1799
10
1900-1999
10
1946-
10
1959-
10
1865-1950
9
1968
9
1735-1826
8
1773-1841
8
1843-1901
8
1767-1845
7
1945-
7
1945-1989
7
19th century
7
1783-1865
6
1856
6
1916
6
1986-
6
1882-1945
5
1989-
5
2000-2099
5
Since 1865
5
1789 - 1815
4
1789-1797
4
1789-1815
4
1800
4
1865-
4
1919-
4
1924-
4
1924-2018
4
1933-1945
4
1948
4
1982-
4
2017-2021
4
2020
4
Civil War, 1861-1865
4
Since 1951
4
Since 1959
4
more ...