The U.S. Constitution required the ratification of ten of the thirteen states to go into effect. Eventually all thirteen ratified it.
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2/3rds of votes were needed
Nine states had to ratify the Constitution before it could become law.
Ratification needed a 2/3 majority, or 9 states.
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Article VII of the Constitution required nine of thirteen states to ratify the Constitution for it to become law. In June 1788, New Hampshire became the ninth state. Rhode Island was the last of the states to ratify, in May 1790.