Biography of America is a very ambitious video and text U.S. History presentation. Much of it isn’t accessible to English Language Learners.
However, the link that I’ve included in this post, and which I’ve also added to my website’s U.S. History page, will lead you to a series of links to short interactive Flash exercises that should be accessible to Intermediate English Language Learners.
They’re each images that have a number of “hot spots” you can click on for further information. Each era in U.S. History has one of them.