Era
20th century
660
19th century
431
1900-1999
317
1800-1899
162
Civil War, 1861-1865
132
21st century
110
2000-2099
63
18th century
61
1800-1999
52
1861-1865
50
1873-1947
47
17th century
44
1809-1865
44
1843-1916
36
1939-1945
28
Colonial period, ca. 1600-1775
25
1866-1895
24
16th century
22
Early modern, 1500-1700
18
1564-1616
17
1860-1890
16
1863-1950
16
Early modern and Elizabethan, 1500-1600
16
1500-1700
15
1934-
15
1900-2099
14
1914-1918
14
1933-1945
14
1700-1799
13
1900 - 1999
12
1910-1946
12
1839-1876
11
1854-1861
11
1945-
11
1950-
11
1890-1945
10
1945-1989
10
1966-
10
1600-1775
9
1789-1869
9
1821-1861
9
1944-
9
1989-
9
Revolution, 1775-1783
9
1700-1899
8
1846-1917
8
1867-1910
8
1868?-1939
8
1869-1934
8
1896-1966
8
more ...