Nine of the thirteen states were required to ratify the U.S. Constitution before it could go into effect.

Quick Scoop

  • The rule came from Article VII of the Constitution, which explicitly states that ratification by nine states would be “sufficient for the Establishment of this Constitution between the States so ratifying the Same.”
  • This meant the new government could legally begin operating even if some states initially refused or delayed ratification.
  • In practice, New Hampshire became the crucial ninth state to ratify on June 21, 1788, triggering the implementation of the new constitutional system.

Before all 13 original states were on board, the Constitution was already in force once those key nine ratifications were secured.

TL;DR: The Constitution needed 9 out of 13 states to ratify it before it could go into effect.

Information gathered from public forums or data available on the internet and portrayed here.