Nine, that was the magic number. On June 21, 1788, New Hampshire became the ninth state to ratify the United States Constitution, clearing the three-quarters threshold required to make it the supreme law of the land. The state convention in Concord voted 57 to 47, a razor-thin margin that reflected fierce national debate between Federalists who wanted a strong central government and Anti-Federalists who feared tyranny. Delegates had already rejected the document once that February before reconvening with enough persuasion, and a promise to add a Bill of Rights, to flip the outcome. Virginia and New York, commercial giants whose buy-in was essential, ratified weeks later, but New Hampshire's vote was the legal trigger. James Madison, the Constitution's chief architect, had spent months lobbying delegates across the states, knowing that failure meant the young republic might fracture into rival confederacies. That narrow 57-to-47 tally in a small New England statehouse set in motion the oldest written national constitution still in active use anywhere in the world.