Library of Congress: Teachers
This site has primary sources and lesson plans on a variety of topics in American history, including the Declaration of Independence, the Revolutionary War, and the Constitution of the United States.
Liberty! The Series
The PBS documentary Liberty! The Series is an excellent film for teaching students about important moments in early American history, and their website provides a helpful teaching guide. Episode Two of this series, “Blows Must Decide” is about Common Sense, the Declaration of Independence, and the ensuing war between the colonies and England. Washington University has a VHS copy of Liberty! The Series available to check out in Olin library.