Happy Constitution Day! Constitution Day is celebrated each year on September 17th, the date the United States Constitution was signed in 1787. Arguably the most famous legal document in American history, the Constitution forms the basis of U.S. federal law. It outlines the three branches of the federal government, the relationships between the U.S. States, the process for amending the Constitution, and the rights of the citizens of this country.

You can read the full text of the Constitution and explanations of each article and amendment online at the Constitution Annotated, a project from the Library of Congress and the Congressional Research Service.

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