Noted April Fool's Day events:
1621 - Leaders of the Plymouth colonists, acting on behalf of King James I, made a defensive alliance with Massasoit, chief of the Wampanoags.
1863 - The first U.S. wartime conscription law was enacted.
1918 - The Royal Air Force was established in Britain with the amalgamation of the Royal Flying Corps (RFC) and the Royal Naval Air Service (RNAS).
1920 - Germany's Workers Party changed its name to the Nationalist Socialist German Worker's Party (Nazis).