Era
1961-1970
173
1991-2000
168
20th century
149
1951-1960
109
1981-1990
98
2001-2010
94
1971-1980
81
19th century
56
18th century
40
1931-1940
35
1564-1616
32
1941-1950
31
1921-1930
22
21st century
22
17th century
21
1770-1827
19
Civil War, 1861-1865
19
16th century
14
-approximately 1540
13
2011-2020
12
15th century
11
1933-1945
11
1749-1832
10
1874-1965
10
1917-1963
10
1945-
10
1759-1805
9
Revolution, 1775-1783
9
1412-1431
8
500-1400
8
active 11th century
8
1367-1413
7
1794-1827
7
1809-1865
7
1941-
7
Early modern, 1500-1700
7
To 1961
7
1220-1263
6
1551 or 1552-1605
6
1788-1866
6
1889-1945
6
1944-
6
1969-1974
6
Julio-Claudians, 30 B.C.-68 A.D.
6
Middle English, 1100-1500
6
-30 B.C.
5
10 B.C.-54 A.D.
5
1491-1547
5
1507-1536
5
1631-1700
5
more ...