Era
20th century
38
Civil War, 2011-
30
21st century
9
1965-
7
Civil War, 1994
6
19th century
5
Civil War, 1936-1939
5
1988-
4
1935-
3
1959-1990
3
1863-1877
2
1906-1996
2
1910-1946
2
1918-1945
2
1945-1955
2
1946-
2
1975-1979
2
1979-
2
Civil War, 1861-1865
2
Civil War, 1983-2005
2
German occupation, 1941-1944
2
Revolution, 1791-1804
2
Vietnam War, 1961-1975
2
-1922
1
1509-1564
1
1564-1616
1
16th century
1
1789-1815
1
1847-1944
1
1867-1910
1
1870-1944
1
1879-1933
1
1891-1961
1
18th century
1
1904-1960
1
1906-1975
1
1907-1967
1
1915-
1
1917-1948
1
1920-2002
1
1925-2003
1
1931-1945
1
1933-1945
1
1933-2017
1
1937-1945
1
1939-
1
1945-
1
1945-1990
1
1951-
1
1954-
1
more ...