September 3: The Treaty of Paris, WWII Declaration, & The NFL's Birth | Today in History USA On September 3rd, history was made in diplomacy, global conflict, and sports. This video covers three pivotal events: the signing of the Treaty of Paris in 1783, which ended the American Revolutionary War; the 1939 declarations of war by Britain and France that marked their entry into WWII; and the 1967 AFL-NFL merger that created the modern NFL and the Super Bowl. Subscribe to Today in History USA for m