When did the constitutional convention end?

September 17, 1787

Scene at the Signing of the Constitution of the United States.
The Constitutional Convention  (also known as the Philadelphia Convention,  the Federal Convention,  or the Grand Convention at Philadelphia) took place from May 25 to September 17, 1787, in Philadelphia, Pennsylvania. hope I was helpfull

September 17, 1787 is when The Constitutional Convention ended.

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