On what date was the U.S. Constitution signed, a document connected to America250?

The U.S. Constitution was signed on September 17, 1787, a document connected to America250.

Delegates signed the Constitution at the Pennsylvania State House in Philadelphia, the building now known as Independence Hall. The signing concluded the Constitutional Convention, which had met from May through September 1787 to revise the Articles of Confederation.

Thirty-nine delegates signed the document. George Washington presided over the convention, while James Madison kept detailed notes and is often called the Constitution’s principal architect. The completed Constitution was then sent to the states for ratification.

September 17 is sometimes confused with other constitutional dates. The Constitution became effective after the ninth state, New Hampshire, ratified it on June 21, 1788. The new federal government began operating in 1789, but the document itself was signed in 1787.