Era
20th century
77
19th century
69
1946-
52
21st century
47
1900-1999
36
1800-1899
33
1795
27
Colonial period, ca. 1600-1775
20
Revolution, 1775-1783
20
2001-2009
17
Civil War, 1861-1865
17
1794
16
1945-1989
15
2000-2099
15
1775-1783
14
1989-
14
1791
13
1789-1797
12
1841-1935
12
18th century
12
1798
11
1861-1865
11
1952-
11
1950-
9
1755-1835
8
1783-1865
8
1809-1865
8
1815-1861
8
1933-1945
8
2009-2017
8
1751-1836
7
1797-1801
7
1856-1941
7
1882-1965
7
1924-2005
7
1948-
7
1979-
7
2000
7
17th century
6
1841-1882
6
1919-1933
6
1936-2016
6
1959-
6
1797
5
1831-1881
5
1900-2099
5
1906-1997
5
1931-2013
5
1964-
5
1981-1993
5
more ...