Era
20th century
32
21st century
26
1991-
14
19th century
14
1997-
10
1960-
9
Civil War, 2011-
9
1974-
7
1900-1999
6
Civil War, 1861-1865
6
Since 1960
6
1979-
5
17th century
4
1800-1899
4
1810-
4
Civil War, 1983-2005
4
Civil War, 1983-2009
4
Peloponnesian War, 431-404 B.C.
4
1871-1918
3
1918-1945
3
1946-1974
3
1979-1990
3
1980-
3
1988-
3
1993-
3
2000-2099
3
2011-
3
Civil War, 1994
3
Civil War, 2002-2007
3
Since 1800
3
Since 1900
3
1588-1679
2
1824-1948
2
1948-
2
1960-1991
2
1960-1997
2
1969-
2
1979-1992
2
1989-
2
1992-
2
2003-
2
2003-2011
2
2011
2
265-30 B.C.
2
Civil War, 1936-1939
2
Civil War, 1967-1970
2
Civil War, 1975-2002
2
Civil War, 1990-1993
2
Civil War, 1991-2002
2
Civil War, 1997
2
more ...