Era
Civil War, 1861-1865
9
1861-1865
4
1846-1848
3
1939-1945
3
1760-1789
2
1760-1820
2
1789-1945
2
1809-1865
2
1917-1921
2
1918-1945
2
1942-1945
2
1945-1989
2
1945-1992
2
1975-
2
Revolution, 1917-1921
2
Since 1975
2
1741-1827
1
1773-1841
1
1812-1815
1
1837-1841
1
18th century
1
1920-2005
1
1940-1980
1
19th century
1
20th century
1
War of 1812
1
d. 1944
1