Era
20th century
46
19th century
42
18th century
28
1945-
9
17th century
7
1797-1851
4
1918-1945
4
1933-1945
4
1989-
4
Colonial period, ca. 1600-1775
4
1564-1616
3
1775-1817
3
1819-1891
3
1897-1962
3
1930-2004
3
1945-1989
3
1713-1784
2
1770-1850
2
1809-1849
2
1830-1886
2
1856-1939
2
1857-1924
2
1882-1941
2
1885-1972
2
1894-1971
2
1975-
2
1989-1993
2
Civil War, 1861-1865
2
Early modern, 1500-1700
2
Revolution, 1775-1783
2
1214-1270
1
1268-1559
1
1552?-1599
1
1558-1603
1
1559?-1634
1
1564-1593
1
1573?-1637
1
1578-1657
1
1596-1650
1
1625-1664
1
1639-1699
1
1649-1775
1
1660 or 1-1731
1
1668-1744
1
1707-1754
1
1721-1771
1
1743-1825
1
1749-1823
1
1750-1815
1
1760-1789
1
more ...