Era
20th century
1,001
1900-1999
347
19th century
334
21st century
182
1975-
110
1800-1899
104
2000-2099
88
Civil War, 1861-1865
62
1980-
52
1929-1968
50
1865-1877
45
1945-1989
45
To 1964
43
1877-1964
41
Since 1975
38
1868-1963
35
1865-1918
34
1989-
31
2009-2017
30
1945-
28
1800-1999
26
18th century
26
2001-2009
23
2008
23
1861-1865
20
1809-1865
19
1933-1945
19
To 1863
19
1960-1980
17
Colonial period, ca. 1600-1775
17
1863-1877
16
1900 - 1999
16
1900-2099
16
1946-
16
1993-
16
Since 1900
16
1818-1895
14
1963-1969
14
1964-
14
1980-2020
14
1918-1961
13
1924-1987
13
1951-
13
Since 1980
11
To 1999
11
1961-1969
10
1973-2020
10
1783-1865
9
1925-1965
9
1964-1975
9
more ...