Era
19th century
35
20th century
29
18th century
14
1783-1865
10
1900-1999
9
21st century
8
To 1775
8
1775-1783
6
1946-
6
1783-1809
5
1800-1899
5
1865-1918
5
1865-1933
5
1945-1989
5
2017-2021
5
To 1898
5
To 1899
5
1700-1809
4
1861-1865
4
Civil War, 1861-1865
4
Colonial period, ca. 1600-1775
4
Revolution, 1775-1783
4
1751-1836
3
17th century
3
1803-1882
3
1809-1865
3
1815-1861
3
1865-1921
3
1869-1934
3
1933-1945
3
1934-
3
1989-
3
2000-2099
3
To 1865
3
1735-1826
2
1821-1882
2
1945-
2
1960-1980
2
1981-1989
2
2016
2
To 1799
2
1600-1775
1
1632-1704
1
1700 - 1809
1
1700-1899
1
1723-1780
1
1743-1826
1
1767-1848
1
1775-1865
1
1783-1815
1
more ...