Era
20th century
445
1900-1999
294
19th century
134
1951-
111
1945-1989
98
1933-1945
80
Since 1900
70
1800-1899
69
1865-1950
61
1989-
60
Since 1951
58
21st century
56
Civil War, 1861-1865
51
Since 1945
51
1775-1783
50
1861-1865
49
18th century
48
1809-1865
45
1945-
42
1946-
41
1815-1861
40
1882-1945
35
1783-1809
32
17th century
30
1837-1901
29
1913-1994
28
1969-1974
28
1783-1865
27
Revolution, 1775-1783
26
1849-1877
24
2000-2099
24
1963-1969
23
16th century
22
1700-1799
22
1775-1865
21
1918-1933
21
1914-1945
20
2017-
20
To 1865
19
1743-1826
18
1732-1799
17
1856-1924
17
1889-1945
17
1913-1921
17
1961-1963
17
1936-1953
16
1980-
16
2009-2017
16
1783-1789
15
1953-1961
15
more ...