Era
20th century
1,903
19th century
753
21st century
596
1564-1616
273
1946-
270
Civil War, 1861-1865
201
1945-
150
1981-1989
123
1933-1945
122
1900-1999
118
2009-
118
18th century
112
Revolution, 1775-1783
111
1812-1870
109
17th century
101
1952-
100
2001-2010
98
1948-
97
Colonial period, ca. 1600-1775
95
1963-1969
93
1913-1994
86
2011-2020
84
1917-1963
78
1944-
74
1961-1969
74
1929-1968
73
1941-
71
1918-1945
67
1882-1945
65
1942-
65
1951-
65
1926-
64
1889-1945
63
1935-
63
1955-
62
1929
60
1908-1973
59
1960-
59
1993-
55
1964-
53
To 1863
53
1980-
52
1930-
51
1947-
51
1800-1859
50
1865-1877
50
1858-1919
49
1966-
49
1969-
49
1969-1974
49
more ...