In this section, we'll highlight key anniversaries and events in constitutional history as featured on our Civic Calendar.

This coming Monday is Martin Luther King Jr. Day. To learn more about King and his legacy, check out some of the National Constitution Center's content below or visit the Center on Monday for special discounted $5 admission.

"The Senate shall have the sole Power to try all Impeachments. When sitting for that Purpose, they shall be on Oath or Affirmation. When the President of the United States is tried, the Chief Justice shall preside: And no Person shall be convicted without the Concurrence of two thirds of the Members present."

Read Interpretations on the Interactive Constitution >

The National Constitution Center in Philadelphia brings together people of all ages and perspectives, across America and around the world, to learn about, debate, and celebrate the greatest vision of human freedom in history, the U.S. Constitution. A private, nonprofit organization, the Center serves as America’s leading platform for constitutional education and debate, fulfilling our congressional charter “to disseminate information about the U.S. Constitution on a nonpartisan basis.” 

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