Who had to approve ratify the new constitiution in order for it to become a reality and go into effect?

The new Constitution had to be ratified by at least nine of the thirteen states in order to become effective. This process involved state conventions where delegates debated and voted on the Constitution. Ultimately, the ratification was a crucial step in establishing the framework of the U.S. government. Key figures like George Washington and James Madison played significant roles in promoting its acceptance.