Era
20th century
130
19th century
62
18th century
40
1945-1989
32
21st century
25
17th century
24
1588-1679
16
16th century
11
1775-1783
11
1469-1527
10
1945-
10
1632-1704
9
Civil War, 1861-1865
9
1989-
8
1806-1873
7
1933-1945
7
1564-1616
6
1642-1727
6
1712-1778
6
1818-1883
6
1879-1955
6
1729-1797
5
1789-1815
5
Early modern, 1500-1700
5
To 1500
5
1564-1642
4
1751-1836
4
1783-1809
4
1805-1859
4
1809-1882
4
1844-1900
4
1905-1980
4
1906-1975
4
1946-
4
1950-
4
1963-1969
4
1980-2020
4
Medieval, 500-1500
4
Revolution, 1775-1783
4
To 500
4
1689-1755
3
1757-1804
3
1770-1831
3
1775-1865
3
1780-1831
3
1815-1861
3
1864-1920
3
1902-1968
3
1951-
3
1970-
3
more ...