In September of 1787, the Founding Fathers signed the most influential document in American history, the U.S. Constitution. Every year, the National Constitution Center hosts Constitution Day celebrations. It also provides a high-school level curriculum that gives an overview of the constitution, principles of the American Revolution, the Constitutional Convention and Ratification, the Bill of Rights, and much more. For those wanting a quick review check out this informative website: https://constitutioncenter.org/education/constitution-101-curriculum; a shorter version is also provided by the White House.