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Rhode Island was the last state to ratify the Constitution (May 29, 1790).
rhode island
The original colonies that formed the United States, in the order that they each ratified the Constitution, were:DelawarePennsylvaniaNew JerseyGeorgiaConnecticutMassachusettsMarylandSouth CarolinaNew HampshireVirginiaNew YorkNorth CarolinaRhode Island
Of the original 13: Rhode Island in 1790, but the last state of the 50 that we have now, was Hawaii on 8/21/1959.
The Constitution was ratified by all 13 colonies. The last two states to ratify it were North Carolina and Rhode Island.