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The Seventeenth Day of September in the Year of our Lord one thousand seven hundred and Eighty seven. 9/17/1787 That is not the date that the United States was actually established; in other words, the Constitution did not take effect on that date. Technically, it took effect when it was signed by the 9th state to ratify it: New Hampshire. That happened June 21, 1788.

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14y ago

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