Historical Period
20th century
448
19th century
210
1975-
170
To 1964
97
21st century
95
1964-1975
49
Civil War, 1861-1865
39
18th century
26
1868-1963
25
1877-1964
20
1865-1918
19
1980-2020
18
1960-1980
16
1945-
15
To 1863
15
1865-1945
10
1800-1899
9
1862-1931
9
1929-1968
9
1963-1969
9
1863-1877
8
1865-1950
8
1951-
8
1980-
8
1865-
7
1900-1999
7
1993-
7
1775-1865
6
1861-1865
6
1894-1962
6
1929
6
1944-
6
1964-
6
Colonial period, ca. 1600-1775
6
To 1865
6
1838-1899
5
1918-1932
5
1924-1987
5
1933-1945
5
1961-1969
5
1989-
5
1809-1865
4
1865-1877
4
1865-1898
4
1865-1933
4
1898-1951
4
1908-1973
4
1920-1980
4
1966-
4
1969-1974
4
more ...