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The Constitution of the United States was ratified on September 17, 1787.

Actually, while the Constitution reached its final form on September 17, 1787, it was, according to Article 7, not "ratified" until at least 9 states had ratified it. The 9th state to do so was New Hampshire, which ratified it on June 21, 1788.

The final state to ratify it was Rhode Island on May 29, 1790, so you could also consider that a valid answer to the question.

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13y ago

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