Era
21st century
11
20th century
8
2009-
5
19th century
4
2001-2009
4
1945-
3
1980-2020
3
1981-2001
3
To 1865
3
1850-1924
2
1854-1951
2
1865-1918
2
1869-1928
2
1815-1861
1
1837-1930
1
1838-1918
1
1846-1916
1
1865-1900
1
1884-1962
1
1901-1990
1
1918-1945
1
1921-2016
1
1960-1980
1
1978-
1
1981-1993
1
Civil War, 1861-1865
1
Colonial period, ca. 1600-1775
1