The US Constitution was adopted on the 17th of September, 1787,
by the Constitutional Convention in Philadelphia, Pennsylvania.
Article Seven of the Constitution required that at least nine
states must ratify the constitution in order for it to come into
effect. The first state to ratify the Constitution was Delaware on
7th December, 1787. The ninth was New Hampshire on the 21st of
June, 1788. The last of the 13 states to ratify was Rhode Island on
the 29th of May 1790.
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