Era
20th century
791
1900-1999
401
19th century
361
21st century
271
1800-1899
136
2000-2099
130
1951-
119
18th century
100
1989-
96
1945-1989
88
Civil War, 1861-1865
85
1945-
79
Since 1945
74
1865-1950
64
1809-1865
55
Since 1900
55
1861-1865
54
17th century
49
1933-1945
49
1946-
49
Since 1951
44
Revolution, 1775-1783
42
2001-2009
39
1837-1901
36
1900-2099
36
1815-1861
31
1800-1999
29
1991-
29
2009-2017
29
1775-1865
28
1980-
28
1918-1945
27
1775-1783
26
1700-1799
25
1939-1945
24
Since 1989
22
1979-1997
21
1783-1865
20
1960-
20
Colonial period, ca. 1600-1775
20
To 1865
19
1963-1969
18
Since 1991
18
1913-1994
17
1993-2001
17
1767-1845
16
1990-
15
1700-1899
14
1882-1945
14
1901-1936
14
more ...