Constitution Day and Citizenship Day commemorate the signing of the United States Constitution on Sept. 17, 1787.

Constitution Day and Citizenship Day

Observed this year on Thursday, Sept. 17.

Explore the Constitution, its history and what it means today through an Interactive Constitution provided by the National Constitution Center.

National Constitution Center
Learn about the history, significance, and current relevance of the U.S. Constitution through interactive resources and educational materials.
The U.S. Constitution (Full Text)
Access the complete text of the U.S. Constitution as preserved by the National Archives.
Constitution Annotated
Explore a detailed explanation of the Constitution’s provisions and how they have been interpreted by courts and scholars over time.
Bill of Rights Institute
Discover engaging educational tools, videos, and articles about constitutional rights, civic responsibility and the foundations of American government.