Era
To 1865
20
19th century
11
20th century
8
Jusqu'à 1865
7
1783-1865
6
1960-1980
5
1865-1918
4
1865-1933
4
1945-1953
4
1945-1989
4
1980-
4
To 1775
4
1849-1861
3
1900-1999
3
1918-1945
3
1933-1945
3
1945-
3
Civil War, 1861-1865
3
Colonial period, ca. 1600-1775
3
1775-1783
2
1815-1861
2
1829-1837
2
1865-1900
2
18th century
2
1960-
2
1963-1969
2
1975-
2
2001-
2
Revolution, 1775-1783
2
Since 1945
2
1591-1643
1
1737-1809
1
1783-1789
1
1789-1809
1
1800-1899
1
1837-1841
1
1839
1
1849-1877
1
1853-1857
1
1856-1929
1
1857-1861
1
1861-1865
1
1865-1898
1
1865-1921
1
1868-1938
1
1877-1881
1
1882-1945
1
19. sz
1
1909-1913
1
1917-1963
1
more ...