Era
To 1848
58
20th century
44
19th century
28
1510-1554
21
1900-1999
19
1848-
16
16th century
12
Civil War, 1861-1865
8
1500-1599
6
1800-1899
6
Spanish colony, 1540-1810
6
1945-1989
5
1848-1929
4
1945-2014
4
1951-
4
Colonial period, ca. 1600-1775
4
Since 1848
4
To 1500
4
1549?-1624
3
1600-1750
3
1750-1815
3
1815-1879
3
1821-1861
3
1822-1893
3
1856-1932
3
1856-1940
3
1877-1972
3
18th century
3
1933-1945
3
Spanish colony, 1565-1763
3
To 1810
3
To 1912
3
1600-1775
2
1693-1740
2
1806-1850
2
1815-1875
2
1817-1882
2
1817?-1863
2
1825-1906
2
1829-1909
2
1834-1902
2
1843-1925
2
1850-1882
2
1850-1908
2
1853-1935
2
1854-1936
2
1861-1865
2
1866-1895
2
1888-1964
2
1889-1956
2
more ...