Era
20th century
121
19th century
37
1900-1999
21
1900 - 1999
14
1819-1892
10
1883-1963
7
1809-1849
6
21st century
6
Colonial period, ca. 1600-1775
6
1885-1972
5
1800 - 1899
4
1917-1977
4
1930-
4
Civil War, 1861-1865
4
1800-1899
3
1800-1999
3
1830-1886
3
18th century
3
1910-1970
3
1911-1979
3
1927-2017
3
1929-2012
3
Revolutionary period, 1775-1783
3
1604?-1683
2
1783-1865
2
1800 - 1999
2
1803-1882
2
1860-1936
2
1874-1925
2
1879-1955
2
1888-1965
2
1889-1973
2
1902-1967
2
1921-2017
2
1926-2001
2
1927-2014
2
1928-1974
2
1940-
2
1943-2023
2
-1668?
1
1600 - 1775
1
1600 - 1783
1
1600-1783
1
1608-1674
1
1612?-1672
1
1642-1729
1
1700 - 1799
1
1743-1826
1
1783 - 1865
1
1783-1850
1
more ...