The last four states to ratify the Constitution were Virginia (June 25, 1788), New York (July 26, 1788), North Carolina (November 21, 1789), and Rhode Island (May 29, 1790). Rhode Island had refused to send delegates to the Constitutional Convention in 1787. As the Constitution only need the approval of nine states to take effect, it was already the supreme law of the land at the time of the last four states' ratification.
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The Constitution was ratified by all 13 colonies. The last two states to ratify it were North Carolina and Rhode Island.
Rhode Island was the last state to ratify the Constitution (May 29, 1790).
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