Historical Period
20th century
187
19th century
81
1951-
42
1945-
33
21st century
27
1865-1950
26
18th century
26
1945-1989
20
1933-1945
16
1989-
16
1991-
15
1946-
14
1815-1861
11
1837-1901
11
Civil War, 1861-1865
11
1809-1865
10
1763-1835
9
1849-1877
9
1882-1945
9
Revolution, 1775-1783
9
1936-1953
8
1944-
8
1985-1991
8
1811-1872
7
1917-1963
7
1919-1952
7
1936-
7
1722-1803
6
1725-1797
6
1760-1789
6
1775-1783
6
1789-1820
6
1841-1867
6
1874-1965
6
1888-1969
6
1910-1946
6
1918-1945
6
1980-
6
2001-2009
6
To 1775
6
1783-1865
5
1861-1865
5
1865-1933
5
1870-1940
5
1900-1999
5
1935-
5
1947-
5
1963-1969
5
1558-1603
4
1775-1865
4
more ...