Era
20th century
887
19th century
472
21st century
117
18th century
108
Civil War, 1861-1865
58
Revolution, 1775-1783
29
1882-1941
26
Colonial period, ca. 1600-1775
24
1812-1870
22
1843-1916
22
1929
21
1564-1616
20
1775-1817
19
1804-1864
19
1945-
18
17th century
17
1897-1962
16
1840-1928
15
Early modern, 1500-1700
15
1933-1945
14
1819-1891
13
1857-1924
13
1816-1855
12
Civil War, 1936-1939
12
16th century
11
1835-1910
11
Victoria, 1837-1901
11
1819-1880
9
1867-1957
9
German occupation, 1940-1945
9
1547-1616
8
1789-1851
8
1892-1973
8
1899-1961
8
1661?-1731
7
1775-1865
7
1809-1865
7
1822-1913
7
1873-1947
7
1879-1970
7
Anglo-Saxon period, 449-1066
7
Occupation, 1939-1945
7
Revolution, 1917-1921
7
1412-1431
6
1533-1917
6
1797-1851
6
1809-1882
6
1811-1896
6
1821-1881
6
1837-1920
6
more ...