Era
1775-1783
82
1743-1826
75
1783-1809
49
19th century
34
20th century
33
1809-1817
30
1783-1865
29
Civil War, 1861-1865
27
1861-1865
24
1817-1825
20
Revolution, 1775-1783
18
1783-1789
17
1809-1825
17
1945-1989
17
1815-1861
15
1809-1865
14
To 1775
14
1789-1797
12
18th century
12
1961-1963
12
1969-1974
12
21st century
11
1933-1945
10
1974-1977
10
Colonial period, ca. 1600-1775
10
1732-1799
9
1775-1865
9
1900-1999
9
1913-1994
8
1917-1963
8
2009-2017
8
1775-1809
7
1800-1899
7
1945-1953
7
2000-2099
7
1751-1836
6
1857-1861
6
1963-1969
6
To 1865
6
1757-1804
5
1758-1831
5
1767-1845
5
1789-1815
5
1849-1877
5
1913-2006
5
1945-1990
5
1735-1826
4
1789-1809
4
17th century
4
1802-1878
4
more ...