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Constitution Day – also called Citizenship Day is a U.S. federal government observance that honors the creation and adoption of the United States Constitution and all persons who have become U.S. citizens, through birth or naturalization. It is usually observed on September 17, the day in 1787 that the Constitution was signed by the delegates to the Constitutional Convention in Philadelphia, Pennsylvania’s Independence Hall.
On September 17, 1787, forty-two of the 55 delegates to the Constitutional Convention held their final meeting. After four long, hot months of debates and compromises, like The Great Compromise of 1787, only one item of business occupied the agenda that day, to sign the Constitution of the United States of America.