World of empires : precontact-1740
America and the transatlantic Enlightenment : 1741-1800
From republican to romantic : 1800-1850
Contests of intellectual authority : 1850-1890
Modernist revolts : 1890-1920
Roots and rootlessness : 1920-1945
The opening of the American mind : 1945-1970
Against universalism : 1962-1990s.