The University of California, Riverside, has a large History Project called H-GIG . It's fairly complex, maybe even a bit confusing, but there are many interesting links to a variety of U.S. history sites. Give it a look. Inaugural address of the Presidents can be found at the Bartleby Project at Columbia University. The PBS station WGBS in Boston has a site called The American Experience which has sections on many aspects of American History with fine graphics.
Television now has more history material on it than any one person can keep track of.
This site also has Audio Clips of Famous Speeches from Gandhi to President Reagan and many figures in between. The Discovery Channel also has much of historic interest. It in turn is linked to other channels which may have more about history. Tho mas Jefferson's Monticello can teach us much about the great Virginian, how he lived and what he thought about many things from education to democracy to religion, and more. Look for Jefferson quotations on various topics.