Era
20th century
890
1900-1999
236
19th century
223
21st century
134
1945-
113
18th century
57
1800-1899
56
2000-2099
53
Since 1900
50
1970-
43
1980-
35
1918-1945
32
17th century
29
16th century
28
1800-1999
28
1971-
25
1900-2099
24
1945-1989
23
1989-
22
1945-1970
20
Civil War, 1861-1865
17
1933-1945
16
1960-1980
15
1900 - 1999
14
Since 1945
14
1564-1616
13
1783-1865
11
1865-1918
11
1917-1970
11
1961-1969
11
1700-1799
10
1950-
9
Early modern, 1500-1700
9
Since 1970
9
1812-1870
8
1935-1977
8
2001-2009
8
1700-1899
7
1835-1910
7
1919-1933
7
1981-1989
7
1801-1917
6
1837-1901
6
1861-1865
6
1882-1941
6
1918-1932
6
1918-1933
6
1935-
6
1960-
6
1961-1970
6
more ...