Era
20th century
215
1939-1945
110
Civil War, 1861-1865
109
1900-1999
108
19th century
61
1861-1865
28
Revolution, 1775-1783
28
1800-1899
25
2001-2009
19
1914-1918
17
1961-1975
15
1775-1783
14
18th century
14
1939 - 1945
12
1950-1953
12
1933-1945
10
World War, 1939-1945
10
1800 - 1899
9
1900 - 1999
9
1921-
9
Japanese occupation, 1942-1945
9
1945-1955
7
Civil War, 1642-1649
7
German occupation, 1940-1945
7
1700-1799
6
21st century
6
Civil War, 1936-1939
6
1829-1909
5
1917-2014
5
1809-1865
4
1861 - 1865
4
1861-1865 (Guerre de Sécession)
4
1918-
4
1933-
4
1945-
4
1945-1989
4
2003-2011
4
German occupation, 1941-1944
4
Since 1900
4
1066-1485
3
17th century
3
1874-1965
3
1890-1969
3
1899-1902
3
1918-1933
3
1918-2016
3
1924-
3
1945-1990
3
1989-
3
Commonwealth and Protectorate, 1649-1660
3
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