How long did it take to ratify all 13 states?

The United States Constitution, which Congress created and signed in its final draft form on September 17, 1787, obtained the required nine-state approval for ratification 9 months later when New Hampshire became the ninth state to vote to ratify in June 1788. The first state to vote to ratify was Delaware on December 7, 1787. The last of the 13 original states to vote for ratification was Rhode Island in May 1790, 2 years and 8 months after the Constitution was drafted.

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