Which document did the Constitutional Convention sign in Philadelphia in 1787?

The Constitutional Convention signed the United States Constitution in Philadelphia in 1787.

Delegates met at the Pennsylvania State House, now Independence Hall, to revise the Articles of Confederation. They instead produced an entirely new framework for a stronger federal government, including separate legislative, executive, and judicial branches.

Thirty-nine delegates signed the Constitution on September 17, 1787. The document then required ratification by the states before it could take effect. It became operational in 1789, and George Washington was inaugurated as the first president under the new system.

The Articles of Confederation had been the first national governing document, but they created a weak central government. The Constitution replaced them rather than merely amending them. Philadelphia’s role is especially notable because the same building had hosted the Declaration’s adoption eleven years earlier.