Era
20th century
65
19th century
40
1975-
15
To 1964
14
20e siècle
13
Civil War, 1861-1865
13
1900-1999
12
19e siècle
12
1917-
8
1800-1899
7
18th century
6
1877-1964
5
1964-1975
5
1980-
5
1743-1826
4
1863-1877
4
Colonial period, ca. 1600-1775
4
To 1863
4
1800-1999
3
1809-1865
3
1861-1865 (Guerre de Sécession)
3
1933-1945
3
1945-
3
1960-1980
3
Revolution, 1775-1783
3
To 1865
3
1775-1865
2
1783-1865
2
1861-1865
2
1865-1918
2
1871-1938
2
18e siècle
2
1901-
2
1914-
2
1919-1972
2
1925-
2
1925-1965
2
1929-1968
2
1945-1953
2
1946-
2
1961-1963
2
1963-1969
2
1964-
2
1981-
2
1989-
2
1600-1699
1
1600-1750
1
1600-1775
1
1700-1799
1
1700-1899
1
more ...