On this day in history

708: Constantine begins his reign as Catholic Pope.
1634: Lord Baltimore founds the Catholic colony of Maryland.
1668: The first horse race in America takes place.
1807: British Parliament abolishes the slave trade.
1911: A fire at the Triangle Shirtwaist Company, a sweatshop in New York City, claims the lives of 146 workers.
1915: The first submarine disaster occurs when a U.S. F-4 sinks off the Hawaiian coast.
1931: Fifty people are killed in riots that break out in India. Mahatma Gandhi was one of many people assaulted.
1940: The United States agrees to give Britain and France access to all American warplanes.
1954: RCA manufactures its first colour TV set and begins mass production.
1957: The European Common Market Treaty is signed in Rome. The goal is to create a common market for all products – especially coal and steel.
1965: Martin Luther King Jr. leads a group of 25,000 to the state capital in Montgomery, Ala.
1969: John Lennon and Yoko Ono stage a bed-in for peace in Amsterdam.
1970: The Concorde makes its first supersonic flight.
1975: Hue is lost and Da Nang is endangered by North Vietnamese forces. The United States orders a refugee airlift to remove those in danger.
1981: The U.S. Embassy in San Salvador is damaged when gunmen attack, firing rocket propelled grenades and machine guns.
1986: President Ronald Reagan orders emergency aid for the Honduran army. U.S. helicopters take Honduran troops to the Nicaraguan border.

Source: HistoryNet.com