Era
20th century
2,347
19th century
1,010
1900-1999
883
1800-1899
298
21st century
258
18th century
155
Civil War, 1861-1865
149
2000-2099
122
1865-1950
119
1975-
111
1951-
108
1800-1999
86
1929-1968
74
1775-1865
67
1877-1964
67
1865-1877
61
Colonial period, ca. 1600-1775
59
1980-
58
To 1964
55
1945-
51
1945-1989
51
1900 - 1999
48
17th century
46
1861-1865
42
1941-1955
41
Since 1900
41
Since 1975
37
1865-1918
36
1868-1963
36
1989-
32
1863-1877
31
1933-1945
31
2009-2017
30
1900-2099
27
1994-
27
To 1863
25
1700-1799
24
1700-1899
23
1946-
23
2001-2009
23
2008
23
1865-
22
1800 - 1899
20
1809-1865
19
1818-1895
19
1960-1980
19
1600-1799
18
1865-1945
17
1865-1951
17
1918-1961
17
more ...