Era
20th century
38
19th century
10
1960-1980
3
1865-1918
2
1918-1945
2
1933-1945
2
1980-
2
2000
2
Civil War, 1861-1865
2
1783-1789
1
1783-1815
1
1815-1861
1
1817-1862
1
1844-1900
1
1856-1915
1
1862-1931
1
1865-1898
1
1869-1940
1
1875-
1
1882-1945
1
1882-1967
1
1886-1969
1
1887-1986
1
1897-1901
1
1897-1920
1
18th century
1
1908-1973
1
1909-1994
1
1917-1945
1
1917-1963
1
1918-1932
1
1929
1
1929-1933
1
1945-
1
1946-
1
1953-
1
1963-1969
1
1971-
1
1992
1
1993-
1
21st century
1
Civil War
1
Revolution, 1775-1783
1
War of 1898
1
ca. 1897-1920
1
ca. 1900-1920
1