Shimabara Rebellion: Japanese peasant uprising began due to heavy taxation; about 37,000 were beheaded (1637)
Harold Holt: the Australian prime minister went missing and was presumed drowned while swimming off the coast of Portsea, Victoria (1967)
Project Blue Book: US Air Force investigation into UFOs was terminated; the conclusion was that sightings were due to mass hysteria, hoaxes, mistakes and the like (1969)
NAFTA: trade agreement was signed by Canada, the US and Mexico (1992)