Where did the signing of the United States Constitution take place in 1787?

The United States Constitution was signed at Independence Hall in Philadelphia on September 17, 1787.

Independence Hall was then called the Pennsylvania State House. It hosted the Constitutional Convention, where delegates met from May through September 1787 to revise the Articles of Confederation. Instead, they produced an entirely new framework for the federal government.

Thirty-nine delegates signed the final document. The convention represented twelve states because Rhode Island declined to send delegates. George Washington, who presided over the convention, signed first, followed by other delegates who approved the completed text.

The building had already been important in the founding era: the Declaration of Independence was adopted there in 1776. It therefore became associated with both the creation of national independence and the establishment of the U.S. constitutional system. The Constitution took effect after ratification by the required states in 1788.