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Constitution of the United States: Introduction

Information about the U.S. Constitution, the U.S. System of Government, Legal Research, and Constitution Day.

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Background information


About Constitution Day


On September 17, 1787, the final draft of the United States Constitution was signed by 39 delegates. The document was then sent to the states for ratification, and went into effect on June 21, 1788 when New Hampshire became the ninth state to ratify the Constitution.

Constitution Day and Citizenship Day are observed each year on September 17 to commemorate the signing of the Constitution and “recognize all who, by coming of age or by naturalization, have become citizens.”

About This Research Guide


This guide is designed to help you find information about the U.S. Constitution, Constitution Day, our branches of government, legal research, and the State of Illinois.  In addition to the topic headings, look for additional information under the above tabs marked with an arrow - Constitution Day and Constitution.

The U.S. Constitution at the National Archives

Subject Guide

Mingyan Li
Oakton Community College Library Des Plaines Campus

Today's Document from the National Archives


Picture This: Library of Congress Prints & Photos


About this guide

This guide was originally created by Robin K. Dillow.