National Museum of American History
The Museum collects and preserves more than 3 million artifacts—all true national treasures.
A growing database of full text, audio and video (streaming) versions of public speeches, sermons, legal proceedings, lectures, debates, interviews, and other recorded media events. Contains ads, but also some great resources from Dr. M. Eidenmuller @ University of Texas.
Library of Congress - Topics
These pages link to selected collection content available online at the Library of Congress, arranged by broad categories.