Era
20th century
51
19th century
20
1900-1999
15
1775-1865
7
1800-1899
6
18th century
6
21st century
6
Civil War, 1861-1865
6
1865-1950
5
1900 - 1999
5
1877-1964
4
1933-1945
4
Colonial period, ca. 1600-1775
4
1735-1824
3
1816-1902
3
1907-1971
3
1908-1993
3
1934-
3
1934-2014
3
1960-1980
3
1963-1969
3
1964-
3
2000-2099
3
To 1863
3
To 1964
3
-1934
2
1600-1783
2
1600-1799
2
1600-1865
2
17th century
2
1846-1926
2
1859-1933
2
1864-
2
1865-1940
2
1865-1951
2
1866
2
1866-1923
2
1868-1963
2
1870-1943
2
1871-1938
2
1872-1936
2
1874-
2
1874-1946
2
1877-1956
2
1878-1963
2
1882-1933
2
1885-1958
2
1888-1939
2
1892-
2
1895-1982
2
more ...