Era
20th century
36
1900-1999
19
1936-1945
13
1945-
10
21st century
9
19th century
8
1914-1945
7
1900 - 1999
6
1917-1945
6
1600-1868
5
1878-1941
5
1912-1945
5
1945-1953
5
1752-1816
4
1767-1848
4
1868-
4
1895-1965
4
1898-1977
4
1914-1940
4
1918-1945
4
1922-1945
4
1933-1945
4
1939-1945
4
Revolution, 1789-1799
4
Since 1945
4
1783-1865
3
17th century
3
1880-1964
3
1884-1968
3
1884-1975
3
1893-1968
3
18th century
3
1900-1965
3
1912-1949
3
1913-1994
3
1917 - 1945
3
1926-1945
3
1939 - 1945
3
1949-1976
3
1969-1974
3
1981-
3
1981-1995
3
Civil War, 1945-1949
3
Restoration, 1853-1870
3
1600-1699
2
1600-1870
2
1637-1864
2
1644-1912
2
1783 - 1815
2
1783 - 1865
2
more ...