The United States Constitution was signed on September 17, 1787, in Philadelphia, Pennsylvania.

Quick Scoop: Core Fact

  • The Constitution was signed on September 17, 1787.
  • The signing took place at Independence Hall (then the Pennsylvania State House) in Philadelphia.
  • This date is now commemorated in the U.S. as Constitution Day each year.

Extra Historical Context

  • Delegates met through the summer of 1787 to replace the weaker Articles of Confederation with a stronger federal framework.
  • After the document was signed, it was sent to the states and officially took effect once enough states ratified it in 1788.

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