Why is the Constitution Day celebrated on September 17?

Constitution Day is September 17, 2018. Celebrate the ratification of the U.S. Constitution. The Constitution of the United States of America is the supreme law of the United States. read more

Constitution Day in the United States commemorates the signing of the U.S. Constitution, which took place on 17 September 1787. read more

Constitution Day (or Citizenship Day) is an American federal observance that recognizes the adoption of the United States Constitution and those who have become U.S. citizens. It is normally observed on September 17, the day in 1787 that delegates to the Constitutional Convention signed the document in Philadelphia. read more

For the Constitution to be approved, nine States needed to ratify the document. Delaware was the first State to ratify the Constitution on December 7, 1787 with a unanimous vote of 30-0. Rhode Island was the last State which narrowly approved the document by two votes on May 29, 1790, nearly three years later. read more