Era
20th century
44
1900-1999
23
18th century
11
Revolution, 1775-1783
9
19th century
8
English colony, 1763-1784
7
16th century
6
Civil War, 1861-1865
6
Spanish colony, 1565-1763
6
-1400
5
1564-1616
5
To 1821
5
War of 1812
5
1519-1574
4
1608-1674
4
1800-1899
4
1865-1950
4
1882-1941
4
Spanish colony, 1784-1821
4
To 1900
4
1547-1616
3
1632-1704
3
1634-1693
3
1700-1799
3
1703-1791
3
1746-1819
3
1767-1845
3
1800-1865
3
1804-1876
3
1821-1865
3
1821-1880
3
1849-1917
3
1896-1953
3
1961-1971
3
1981-1993
3
21st century
3
Revolution, 1959
3
To 1500
3
To 1810
3
1500-1599
2
1564-1593
2
1565-1763
2
1631-1700
2
1688-1744
2
1689-1761
2
1713-1768
2
1771-1810
2
1775-1865
2
17th century
2
1800-1876
2
more ...