Article Seven of the United States Constitution

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Article Seven of the United States Constitution sets the number of state ratifications necessary for the Constitution to take effect and prescribes the method through which the states may ratify it. Under the terms of Article VII, constitutional ratification conventions were held in each of the thirteen states, with the ratification of nine states required for the Constitution to take effect. Delaware was the first state to ratify the Constitution, doing so on December 7, 1787. On June 21, 1788, New Hampshire became the ninth state to ratify the Constitution, ensuring that the Constitution would take effect. Rhode Island was the last state to ratify the Constitution under Article VII, doing so on May 29, 1790.