Constitution Day

Part of Congress.Gov, THE website to begin your Congressional primary source research, The Constitution Annotated provides a comprehensive overview of how the Constitution has been interpreted over time and is now available on this new site with upgraded search capabilities. The online Constitution Annotated includes discussions of the Supreme Court’s latest opinions. In the coming months, we will be making broader changes to further modernize the Constitution Annotated.

This interactive guide to the U.S. Constitution provides the original text and an explanation of the meaning of each article and amendment. The guide is an excellent research tool for students to use to gain a deeper understanding of one of our nation’s founding documents and the establishment of the federal government.

Digital materials at the Library of Congress related to the U.S. Constitution, as well as links to external websites and a selected print bibliography.

To encourage people everywhere to better understand and appreciate the principles of government that are set forth in America's founding documents, the Cato Institute has produced this website and published highly popular print editions of the Declaration of Independence and the Constitution of the United States of America.