20th century 18
1945-1989 5
19th century 4
18th century 3
1945 3
1945- 3
Civil War, 1861-1865 3
1917- 2
1918-1945 2
1949-1976 2
1492- 1
1648-1789 1
1750 1
1769-1821 1
1775-1783 1
1789-1799 1
1789-1815 1
1789-1945 1
1798-1799 1
1815-1861 1
1865-1951 1
1890-1965 1
1898-1946 1
1912-1970 1
1914-1918 1
1917 1
1917-1948 1
1918- 1
1919- 1
1929 1
1933-1945 1
1939-1945 1
1939-1945 - Sources 1
1945-1955 1
1945-1991 1
1951- 1
1961-1969 1
1961-1975 1
1963-1969 1
1965-1979 1
1967-1973 1
1969-1974 1
1973-1993 1
2001- 1
20th 1
476-1492 1
Colonial period, ca. 1600-1775 1
Revolution, 1775-1783 1
To 1775 1