Era
20th century
52
1939-1945
23
1914-1918
14
German occupation, 1914-1918
14
19th century
12
1900-1999
11
Civil War, 1861-1865
11
1874-1964
8
1926-
8
1926-2022
8
1914 - 1918
7
1939 - 1945
7
German occupation, 1940-1945
7
1960-1997
6
21st century
6
World War, 19141918
6
1800-1899
4
1861-1865
4
1882-1945
4
18th century
4
1924-2018
4
1925-1961
4
1933-1945
4
Civil War, 1960-1965
4
Revolution, 1775-1783
4
1815-1861
3
1861 - 1865
3
1865-1900
3
1871-1932
3
1898-1967
3
1905-1961
3
1914-1951
3
1918-1945
3
1929-2004
3
1930-
3
2008-2009
3
20e siècle
3
Revolution, 1789-1790
3
1815-1900
2
1830-1914
2
1864-1915
2
1865-1898
2
1865-1921
2
1872-1962
2
1875-1934
2
1888-1963
2
1889-1945
2
1889-1974
2
1900 - 1999
2
1900-1980
2
more ...