American Memory (Library of Congress)
Plymouth Colony Archive Project
New Americans (PBS Site on Immigration)
Native American Studies Resources
Images of the American West (National Archives)
Chronology: History of Slavery (Holt House Site)
U. S. Civil War Center (at Louisiana State University)
Timeline of American Literature / History
1492: An Ongoing Voyage (Library of Congress Exhibit)
This American Life (Public Radio Program)
Little House in the Census (Good example of American Studies in the grade-school classroom)
Richard P. Horwitz's American Studies Links (U of Iowa; lots of helpful academic links)