Era
20th century
11
1950-1953
8
1564-1616
6
19th century
6
1894-1956
4
1929
4
1804-1868
3
1831-1915
3
1939-1945
3
Civil War, 1861-1865
3
-30 B.C.
2
1475-1564
2
14th century
2
1759-1833
2
1848-1929
2
1897-1937
2
1899-1980
2
18th century
2
1902-1968
2
1905-1984
2
1912-1928
2
1913-1984
2
1925-2003
2
1925-2008
2
1929-2003
2
1940-
2
1972-1993
2
2001-2009
2
332-30 B.C.
2
83 B.C.?-30 B.C.
2
Colonial period, ca. 1600-1775
2
Empire, 284-476
2
French and Indian War, 1754-1763
2
Medieval period, 987-1515
2
1167-1216
1
1300-1399
1
1600-1775
1
1725-1807
1
1740-1814
1
1754 - 1763
1
1760-1820
1
1770-1827
1
1785-1863
1
1786-1859
1
1789-1851
1
1809-1849, USMA x1834
1
1809-1865
1
1827-1901
1
1833-1883
1
1857-1924
1
more ...