Era
20th century
55
19th century
30
18th century
24
1933-1945
7
1918-1933
6
Colonial period, ca. 1600-1775
6
Revolution, 1775-1783
6
17th century
5
To 1865
5
1783-1865
4
1945-
4
1945-1953
4
1945-1989
4
1775-1783
3
1884-1972
3
1918-1945
3
1953-1961
3
1981-1989
3
1564-1616
2
1783
2
1815-1861
2
1830-1886
2
1840-1928
2
1865-1918
2
1870-1940
2
1949-1976
2
1953-1975
2
1961-1963
2
775
2
Civil War, 1936-1939
2
Colonial period, ca. 1600
2
German occupation, 1941-1944
2
To 1783
2
1552?-1599
1
1612-1672
1
1612?-1672
1
1638-1715
1
1721-1786
1
1724-1796
1
1748-1825
1
1774-1793
1
1775-1865
1
1783-1789
1
1783-1809
1
1783-1850
1
1789-1815
1
1789-1869
1
1789-1900
1
1805-1859
1
1806-1861
1
more ...