Era
20th century
205
1945-1989
161
1989-
133
19th century
80
1775-1865
74
1951-
72
21st century
68
1900-1999
59
1865-1950
57
1981-1989
41
1945-
39
2001-2009
37
2016
34
Since 1945
32
1968-
30
1815-1861
29
1936-2018
29
1946-
28
2000-2099
28
1789-1797
27
1800-1899
26
Civil War, 1861-1865
26
1921-2016
24
1993-2001
24
1933-1945
23
1914-2000
22
1938-
22
2009-2017
22
1783-1865
20
1925-1968
19
1849-1877
17
1861-1865
17
1908-1957
16
Since 1951
16
1963-1969
15
1981-1993
15
1932-2009
14
1977-1981
14
1969-1974
13
1971-1981
13
Since 1900
13
18th century
12
1901-1953
12
1945-1953
12
1981-
12
1775-1783
11
1786-1836
11
1917-1963
11
1940-
11
1940-2020
11
more ...