Era
Revolution, 1775-1783
116
War of 1812
76
1775-1783
41
1775-1865
39
1732-1799
30
1789-1797
25
1797-1801
24
1783-1789
20
Civil War, 1861-1865
20
20th century
19
1865-1950
16
2016
15
1789-1801
14
1809-1865
14
Colonial period, ca. 1600-1775
14
2012
13
1979-
12
To 1865
12
1743-1826
11
1783-1815
11
1977
11
19th century
11
1789-1869
10
18th century
10
1964-
10
2004
10
1812-1815
9
1914-1918
9
1939-1945
9
1945-1989
9
1961-
9
Treaties, 1805
9
1788
8
1890-1969
8
1933-1945
8
1950-
8
1962-
8
1970-
8
1706-1790
7
1803-1865
7
1945-
7
1946-
7
1960-
7
1965-
7
1735-1826
6
1789-1809
6
1797
6
1801-1809
6
1929-1968
6
1958-
6
more ...