Era
20th century
1,934
19th century
760
21st century
604
1564-1616
272
1946-
260
Civil War, 1861-1865
202
1945-
152
17th century
125
1933-1945
125
18th century
118
1900-1999
117
2011-2020
117
Revolution, 1775-1783
111
2009-
110
1812-1870
109
2001-2010
103
1952-
102
Colonial period, ca. 1600-1775
95
1948-
87
1917-1963
77
1961-1969
74
1944-
73
1929-1968
70
1963-1969
69
1918-1945
68
1941-
68
1942-
68
1882-1945
66
1889-1945
66
1913-1994
66
1935-
65
1951-
65
1926-
64
1955-
63
1929
60
1908-1973
58
1960-
58
1947-
54
1964-
53
1993-
53
To 1863
53
1980-
52
1930-
51
1969-
51
1800-1859
50
1865-1877
50
1991-2000
50
1858-1919
49
1991-
49
1865-1918
48
more ...