Era
Civil War, 1861-1865
8
1917-1963
4
1961-1963
4
20th century
4
1866-1895
2
1908-1973
2
1963-1969
2
19th century
2
1746-1786
1
1809-1865
1
1810-1866
1
1815-1862
1
1825-1886
1
1838-1909
1
1839-1876
1
1840-1914
1
1845-1909
1
1855-1933
1
1870-1953
1
1888-1969
1
1933-1945
1
Revolution, 1775-1783
1
Spanish colony, 1540-1810
1
To 1803
1
To 1900
1
approximately 1842-1877
1