Other
Institute for American Liberty: The First Principles of the Constitution [Pdf]
This article contains information about the principles used to create the Constitution of the United States.
Other
Constitution facts.com: Which Founding Father Are You?
Answer five questions to learn which of six Founding Fathers you are most like.
Cornell University
Cornell University: Law School: Constitutional Law Overview
This site from the Cornell University Law School provides an overview of constitutional law as it applies in the United States, with links to additional information.
Scholastic
Scholastic: Grolier: Lewis and Clark: Louisiana Purchase
A summary of one of the largest land purchases in history, the Louisiana Purchase.