Era
19th century
192
20th century
145
1800-1899
54
1900-1999
50
18th century
48
21st century
38
2009-
25
1945-
19
1975-
13
2000-2099
13
17th century
12
1865-1918
11
1700-1799
10
1700-1899
10
1800-1999
10
1980-
10
1918-1932
7
1918-1945
7
Since 1945
7
16th century
6
1821-1880
5
1865-1900
5
1919-1952
5
2000-
5
Since 1900
5
To 1964
5
1800-1918
4
1804-1864
4
1868-1944
4
1900-2099
4
1960-1980
4
1981-
4
Since 1975
4
Since 2000
4
1809-1871
3
1865-1898
3
1888-1918
3
1918-1933
3
2001-2009
3
Civil War, 1861-1865
3
Early modern and Elizabethan, 1500-1600
3
1066-1485
2
1500-1699
2
1564-1616
2
1600-1799
2
1713-1784
2
1740-1814
2
1775-1865
2
1800-1917
2
1801-1917
2
more ...