Era
20th century
57
19th century
36
18th century
15
17th century
11
1564-1616
10
Colonial period, ca. 1600-1775
8
16th century
7
21st century
7
Revolution, 1775-1783
7
Civil War, 1861-1865
6
1783-1815
3
1843-1916
3
1882-1941
3
1892-1926
3
1897-1962
3
1906-1975
3
1913-2005
3
Middle Ages, 500-1500
3
1815-1861
2
1856-1939
2
1873-1947
2
1876-1950
2
1897-1937
2
1897-1993
2
1899-1961
2
1908-1986
2
1913-2000
2
1921-1930
2
1960-1980
2
Early modern, 1500-1700
2
World War, 1914-1918
2
-1400
1
-1774
1
-632
1
1081-1453
1
1463-1509
1
1492-1559
1
1561-1627
1
1570 or 1571-1633
1
1582-1663
1
1591-1643
1
1642-1715
1
1661?-1731
1
1689-1761
1
1689-1801
1
1697-1784
1
1712-1778
1
1726-1785
1
1736-1818
1
1737-1801
1
more ...