The United States Constitution was signed on September 17, 1787, by thirty-nine delegates to the Constitutional Convention. Each year, on September 17, Americans celebrate Constitution Day and Citizenship Day. In addition, September 17-23 is also recognized as Constitution Week. On February 29, 1952, President Harry S. Truman signed "Citizenship Day" into law. Congress requested, on August 2, 1956, that the president proclaim September 17 - September 23 of each year as "Constitution Week".