Era
20th century
151
21st century
69
1564-1616
27
19th century
26
1900-1999
21
Civil War, 1861-1865
16
1939-1945
15
1945-
13
1929
9
2000-
9
17th century
8
1933-1945
8
1944-
8
1800-1899
7
1939-
7
1946-
7
1948-
7
1960-
7
1974-
7
1993-
7
German occupation, 1940-1945
7
1935-
6
1972-
6
Civil War, 1936-1939
6
1770-1827
5
1861-1865
5
1918-1945
5
1919-1947
5
1934-
5
1952-
5
1958-
5
1962-
5
1966-
5
1967-
5
1969-
5
1986-
5
2001-2010
5
2002-
5
1622-1673
4
1769-1821
4
1775-1817
4
1874-1965
4
18th century
4
1913-1991
4
1928-1967
4
1949-
4
1951-
4
1955-
4
1961-
4
1965-
4
more ...