Era
20th century
1,961
19th century
763
21st century
622
1564-1616
273
1946-
273
Civil War, 1861-1865
204
1945-
154
17th century
125
1933-1945
125
1981-1989
125
1900-1999
120
2011-2020
119
18th century
118
2009-
118
Revolution, 1775-1783
111
1812-1870
109
2001-2010
103
1952-
102
1948-
99
Colonial period, ca. 1600-1775
95
1963-1969
94
1913-1994
88
1917-1963
79
1944-
74
1961-1969
74
1929-1968
73
1941-
73
1918-1945
68
1942-
68
1951-
68
1882-1945
66
1889-1945
66
1935-
66
1926-
65
1955-
64
1908-1973
60
1929
60
1960-
60
1969-1974
58
1993-
55
1947-
54
1930-
53
1964-
53
1969-
53
1980-
53
To 1863
53
1966-
51
1800-1859
50
1865-1877
50
1943-
50
more ...