Era
20th century
1,651
19th century
703
18th century
325
Civil War, 1861-1865
228
1945-1989
188
Revolution, 1775-1783
184
1933-1945
182
21st century
174
1775-1783
156
17th century
150
1861-1865
136
To 1775
122
1865-1950
121
1989-
121
1945-
101
1775-1865
97
1815-1861
87
1837-1901
83
16th century
80
Colonial period, ca. 1600-1775
78
1951-
76
1918-1933
74
1783-1865
66
1900-1999
63
1918-1945
60
1809-1865
56
1946-
55
Revolution, 1789-1799
53
1783-1809
52
1917-1936
49
To 1500
44
To 1865
42
1945-1953
41
1870-1940
39
1953-1961
38
1981-1989
38
1603-1714
37
1960-
37
1945-1990
36
1789-1900
35
1865-1933
35
1882-1945
35
1963-1969
35
1961-1963
34
1980-
33
2001-2009
33
1485-1603
32
1865-1900
32
1743-1826
31
1789-1815
31
more ...