Historical Period
20th century
955
19th century
303
21st century
151
1975-
120
Civil War, 1861-1865
53
1877-1964
51
1980-2020
46
To 1964
45
1865-1877
40
1945-1989
40
1929-1968
37
1868-1963
36
2008
32
1865-1918
29
1933-1945
29
1989-
28
2001-2009
28
18th century
27
1945-
27
1900-1999
25
To 1863
22
1964-
21
1809-1865
20
1980-
20
1863-1877
16
1818-1895
15
1861-1865
15
1946-
14
1963-1969
14
1964-1975
13
1993-
13
2009-2017
13
1960-1980
12
Colonial period, ca. 1600-1775
12
1918-1961
11
1862-1931
10
1925-1965
10
1951-
10
1941-1955
9
2009-
9
1908-1973
8
1918-1932
8
1961-1969
8
1981-2001
8
1743-1826
7
1783-1865
7
1865-
7
1865-1898
7
1865-1933
7
1882-1945
7
more ...