Era
20th century
48
1945-
32
1990-
22
21st century
20
1971-1990
14
1918-1945
13
1899-1992
10
1750-1918
9
19th century
8
To 500
7
1918-
6
1600-1750
5
1723-1790
5
Medieval, 500-1500
5
18th century
4
16th century
3
1929
3
1945-1989
3
1989-
3
17th century
2
1883-1950
2
1945-1971
2
1971-1981
2
1980-2020
2
1981-1993
2
1981-2001
2
1991-
2
Civil War, 1861-1865
2
1500-
1
15th century
1
1632-1694
1
1751-1836
1
1768-1849
1
1806-1873
1
1818-1883
1
1835-1917
1
1838-1917
1
1839-1897
1
1879-1964
1
1881-1973
1
1883-1946
1
1886-1964
1
1887-1975
1
1896-1988
1
1904-1989
1
1905-1989
1
1907-1995
1
1908-2001
1
1908-2006
1
1911-1991
1
more ...