Era
20th century
295
1900-1999
123
19th century
73
1868-1963
30
1800-1899
26
21st century
18
1975-
16
1818-1895
10
1856-1915
10
1800-1999
9
18th century
8
1783-1850
6
1900 - 1999
6
1924-1987
6
1865-1918
5
1885-1954
5
1900-2099
5
1908-1960
5
2000-2099
5
Colonial period, ca. 1600-1775
5
Revolutionary period, 1775-1783
5
To 1964
5
1874-1938
4
1877-1964
4
1887-1940
4
1890-1948
4
1894-1967
4
1915-1998
4
1925-1965
4
1929-1968
4
1980-
4
1989-
4
Since 1975
4
1819-1898
3
1865-1999
3
1874-1946
3
1877-1999
3
1916-1987
3
1933-1945
3
2001-2009
3
To 1999
3
1723-1792
2
1743-1826
2
1785-1830
2
1795-1881
2
1800 - 1899
2
1800 - 2009
2
1819-1891
2
1826-1894
2
1832-1912
2
more ...