1912 – The Girl Guides (later renamed the Girl Scouts of the USA) were founded in the United States.
1923 – Phonofilm, the first motion picture with a sound-on-film track was demonstrated at a press conference by Dr. Lee De Forest, who was also the inventor of the radio tube in 1907.
1928 – St. Francis Dam collapsed San Francisquito Canyon, California
1933 – New resident Franklin D. Roosevelt gave his first national radio address or “fireside chat,” from the White House.1951 – Two entirely different comic strips appeared both called “Dennis The Menace”, Dennis UK became Dennis and Gnasher. Neither author was aware of the other’s existence.
1951 -Eric Morley organized a bikini contest as part of the Festival of Britain, and it was intended as a promotion for the recently introduced bikini, which was widely regarded as immodest. It then went on to become an annual event called the Miss World Competition.
1951 – The first sex change operation was performed in Denmark. George William Jorgensen, Jr. was transformed into Christine Jorgensen.
1951 – The Explorers Club in NYC hosted a dinner featuring meat from a woolly mammoth.
1987 – Les Miserables (Broadway Musical) Opened on March 12, 1987 and Closed: May 18, 2003
1988 – #1 Hit March 12, 1988 – March 25, 1988: Rick Astley – Never Gonna Give You Up
1993 – ’93 Superstorm stretched from the Gulf of Mexico to the northeastern US. 318 were killed.
1994 – #1 Hit March 12, 1994 – April 8, 1994: Ace Of Base – The Sign
1994 – The Church of England ordained its first female priests.
1999 – Former Warsaw Pact members the Czech Republic, Hungary and Poland joined NATO (North Atlantic Treaty Organization).
2003 – Bend It Like Beckham debuted in theaters.
2003 – 15-year-old Elizabeth Smart was found in Sandy, Utah, nine months after being abducted from her Salt Lake City home.
2003 – The Dixie Chicks’ lead singer, Natalie Maines said, in an interview with The Gaurdian “Just so you know, we’re on the good side with y’all. We do not want this war, this violence. And we’re ashamed the President of the United States is from Texas.” That lead to a revolt from many of their fans.
2004 – Agent Cody Banks 2: Destination London and NASCAR 3D: The IMAX Experience debuted in theaters.
2008 – Hulu opened online.
2012 – John Carter debuted in theaters.