Historical Period
20th century
51
1945-
24
19th century
24
18th century
19
Civil War, 1861-1865
13
Revolution, 1789-1799
12
21st century
11
1970-
10
To 1500
9
1783-1865
7
17th century
7
1865-1918
7
Revolution, 1775-1783
7
1789-1820
6
1564-1616
4
To 146 B.C.
4
1638-1715
3
1785-1879
3
1812-1870
3
1945-1970
3
1976-2002
3
1980-2020
3
1981-1989
3
527-1081
3
63 B.C.-14 A.D.
3
Allied occupation, 1945-1952
3
Cultural Revolution, 1966-1976
3
Early modern, 1500-1700
3
Revolution, 1954-1962
3
1066-1485
2
1509-1564
2
16th century
2
1738-1820
2
1769-1852
2
1788-1824
2
1789-1815
2
1789-1830
2
1803-1882
2
1804-1881
2
1805-1859
2
1809-1882
2
1835-1910
2
1835-1919
2
1838-1918
2
1848-1903
2
1858-1919
2
1863-1952
2
1865-1900
2
1888-1923
2
1918-1945
2
more ...