In 1784, the United States ratified the Treaty of Paris ending the Revolutionary War; Britain followed suit in April 1784.
1814: The Treaty of Kiel ended hostilities between Denmark and Sweden, with Denmark agreeing to cede Norway to Sweden, something Norway refused to accept.
1900: Puccini's opera "Tosca" had its world premiere in Rome.
1914: Ford Motor Co. greatly improved its assembly-line operation by employing an endless chain to pull each chassis along at its Highland Park plant.
1943: President Franklin D. Roosevelt, British Prime Minister Winston Churchill and French General Charles de Gaulle opened a wartime conference in Casablanca.
1966: Fifth Avenue and Madison Avenue in Manhattan were converted from two-way to one-way streets to improve traffic flow. (To this day, vehicles head south on Fifth, while traveling north on Madison.)