Historical Period
20th century
138
19th century
47
18th century
44
21st century
41
1945-
23
To 1500
20
17th century
17
1783-1865
11
1815-1861
8
1945-1970
8
1951-
8
1971-
8
1660-1714
7
1837-1901
7
1900-1999
7
1945-1989
7
1975-
6
1945-1953
5
2000-
5
Civil War, 1861-1865
5
1533-1613
4
1628-1702
4
1865-1918
4
1901-1936
4
1918-1933
4
1949-
4
1953-1961
4
1979-1997
4
1989-
4
To 70 A.D.
4
1702-1714
3
1760-1789
3
1775-1865
3
1789-1815
3
1789-1820
3
1802-1866
3
1805-1859
3
1865-1900
3
1865-1950
3
1878-1944
3
1908-1957
3
1918-1945
3
1925-1979
3
1929-1985
3
1939-1945
3
1939-1975
3
1942-2011
3
1945-1990
3
1968-1989
3
1969-1974
3
more ...