At which Philadelphia building was the U.S. Constitution signed in 1787?

The U.S. Constitution was signed at Independence Hall in Philadelphia in 1787.

The signing took place on September 17, 1787, at the building then known as the Pennsylvania State House. Delegates had met there during the Constitutional Convention to replace the Articles of Confederation with a stronger federal framework.

Thirty-nine delegates representing 12 states endorsed the final document. Rhode Island declined to send delegates to the convention. The building is especially significant because the Declaration of Independence had also been debated and adopted there in 1776.

A common mix-up is Federal Hall in New York City, where George Washington was inaugurated and where the first Congress met under the Constitution. Independence Hall remains the best-known name for the Philadelphia building, which is now part of Independence National Historical Park.