Era
20th century
548
19th century
218
Civil War, 1861-1865
60
21st century
46
Revolution, 1775-1783
25
18th century
24
Colonial period, ca. 1600-1775
24
1819-1891
17
1843-1916
12
1564-1616
11
1899-1961
11
1945-
11
1783-1865
10
1945-1989
10
1993-2001
10
1803-1882
9
1804-1864
9
1819-1892
9
1835-1910
9
1830-1886
8
1862-1937
8
1989-
8
1867-1957
7
1783-1850
6
17th century
6
1915-1985
6
1915-2005
6
1929
6
Revolutionary period, 1775-1783
6
War of 1812
6
1817-1862
5
1873-1947
5
1888-1953
5
1897-1962
5
1933-1945
5
1970-
5
1789-1851
4
1811-1896
4
1865-1898
4
1885-1972
4
1896-1940
4
1907-2003
4
1944-
4
1946-
4
1957-
4
1960-
4
1989-1993
4
1743-1826
3
1758-1843
3
1771-1810
3
more ...