On June 21, 1788, New Hampshire ratified the US Constitution; the 9th state to do so, thus meeting the necessary minimum. At that point, the Constitution became the Law.
Patriot’s Day is celebrated today, but Paul Revere’s Ride was actually tonight – April 18, 1775. Paul Revere crossed the Charles River to Cambridge, then rode his horse towards Lexington to warn the partisans there. He almost made it. Other riders carried the news further.