Historical Period
20th century
143
1975-
97
19th century
68
To 1964
49
21st century
42
1964-1975
37
1980-2020
14
Civil War, 1861-1865
11
18th century
9
1868-1963
8
To 1863
8
1945-
7
1960-1980
7
1877-1964
6
1929-1968
5
Colonial period, ca. 1600-1775
5
1775-1865
4
1863-1877
4
1865-1918
4
1865-1945
4
1993-
4
1862-1931
3
1865-1877
3
1924-1987
3
1933-1945
3
1963-1969
3
1964-
3
To 1865
3
17th century
2
1813-1897
2
1818-1895
2
1838-1899
2
1856-1915
2
1865-1898
2
1865-1950
2
1908-1973
2
1914-2006
2
1918-1932
2
1941-
2
1942-2016
2
1944-
2
1951-
2
1956-
2
1961-1969
2
1961-1994
2
1966-
2
2008
2
2009-2017
2
-1875
1
-2014
1
more ...