Every year on September 17, the United States observes Constitution Day, also known as Citizenship Day. While it’s not a public holiday (you can check this guide to U.S. federal holidays if you’re curious), it’s still an important date: it commemorates the signing of the U.S. Constitution, one of the country’s most significant documents. Since 2005, the day officially honors both the Constitution and those who have become U.S. citizens.

If you’ve spent any time in the U.S. or watched American political debates, you’ve probably heard references to “constitutional rights.” The Constitution holds a central place in American life—so here’s a quick guide to what it is and why it matters.

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10 Things to Know About the U.S. Constitution

1. Signed on September 17, 1787
The Constitution was signed by 39 delegates at the Constitutional Convention in Philadelphia, following the American Revolution and independence from Great Britain. These delegates are also called the “framers” of the Constitution.

2. A Blueprint for Government
Its main purpose was to unite the states under a centralized federal government and establish a framework with three separate branches:

• Executive (President and administration)
• Legislative (Congress)
• Judicial (Supreme Court and federal courts)

3. Only 13 States at the Time
In 1787, the U.S. consisted of just 13 states. Each one sent delegates to the convention – except Rhode Island, which opposed a strong central government and chose not to participate.

4. Ratification Wasn’t Automatic
Before the Constitution could take effect, it needed to be ratified by nine states. To help convince the public, Alexander Hamilton, James Madison, and John Jay wrote a series of 85 essays known as the Federalist Papers, explaining and defending the document.

5. “We the People”
The Constitution begins with the now-famous words: “We the People.” This iconic phrase reflects the idea that the government’s power comes from the people—not a king or ruler.

6. Amended 27 Times
Since it was written, the Constitution has been amended 27 times. These amendments are official changes or additions made over the years to reflect evolving laws and values.

7. The Bill of Rights Came Later
Originally, the Constitution didn’t include protections for individual freedoms. That’s why the Bill of Rights – the first 10 amendments – was added in 1791, guaranteeing freedoms like speech, religion, and the right to a fair trial.

8. George Washington Became the First President
After the Constitution was adopted, George Washington, a national hero from the American Revolution, was unanimously elected as the first U.S. President. He was inaugurated on April 30, 1789.

9. James Madison: “Father of the Constitution”
James Madison played a key role in drafting the Constitution, contributing to both the main document and the Bill of Rights. He’s often called the “Father of the Constitution.”

10. You Can Visit the Signing Site
The building where the Constitution was signed is now known as Independence Hall in Philadelphia, Pennsylvania. It’s open to the public—and if you’re a fan of American history, it’s definitely worth a visit.

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Final Thoughts

Whether you’re an expat, a student of American government, or just curious about the U.S. system, understanding the Constitution is key to understanding how the country works. Constitution Day is a reminder of the values, debates, and compromises that continue to shape the nation.