Era
20th century
142
Civil War, 1861-1865
94
1929
80
21st century
66
1901-1953
53
19th century
45
Revolution, 1775-1783
43
1933-1945
41
1945-1953
41
1953-1961
41
1945-1989
37
1961-1969
34
1969-
31
1969
25
1783-1865
18
1882-1945
14
1946-
13
1939-1945
11
1858-1919
9
1929-1968
9
1945-1955
9
2020
8
1955-1965
7
1884-1962
6
Early accounts to 1600
6
1809-1865
5
1917-1963
5
1919-1932
5
1564-1616
4
16th century
4
1756-1836
4
17th century
4
1874-1965
4
1897-1937
4
2001-2009
4
2009-
4
1775-1865
3
1856-1924
3
1898-1951
3
1919-1933
3
1942-
3
1957-2011
3
2009
3
Colonial period, ca. 1600-1775
3
World War, 1939-1945
3
1732-1799
2
1743-1826
2
1744-1786
2
1815-1902
2
1818-1895
2
more ...