Era
20th century
458
1900-1999
188
19th century
185
21st century
108
17th century
64
1800-1899
54
18th century
46
1939-1945
32
1941-1955
31
Civil War, 1994
30
2000-2099
26
1985-
25
16th century
23
1945-
22
1991-
21
To 1500
21
Civil War, 1983-2005
18
1752-1773
16
1979-
16
1773
15
1946-
14
1800-1999
13
1859-1930
13
1933-1945
13
1952-
13
1980-
13
1960-
11
2001-2009
11
1700-1799
10
1900-2099
10
1941-2006
10
1961-
10
Early modern, 1500-1700
10
1564-1616
9
Charles II, 1660-1685
9
-1778
8
1975-
8
1989-
8
Civil War, 2011-
8
Since 1991
8
1899-1947
7
1906-1962
7
1991-1995
7
1993-
7
2000-
7
Colonial period, ca. 1600-1775
7
-1770
6
1746-1778
6
1770
6
1939-1964
6
more ...