NBC-TV on the same day. On television it is not shown in prime time, but as an afternoon matinée, in a slightly cut version, one of the first such experiments. Olivier is later nominated for an Oscar for his performance. March 12 – 96 U.S. Congressmen sign the Southern Manifesto, a protest against the 1954 Supreme Court ruling (Brown v. Board of Education) that desegregated public education. March 13 – Elvis Presley releases his first gold album titled Elvis Presley in the United States. March 15 – The Broadway musical My Fair Lady opens in New York City. March 19 – At age 48, Dutch boxer Bep van Klaveren contests his last match in Rotterdam. March 20 – Tunisia gains independence from France. March 21 – The 28th Academy Awards Ceremony is held in Los Angeles. Marty is awarded Best Picture. March 23 – Pakistan becomes the first Islamic republic, and a national holiday is observed in the country, including the state of East Pakistan. April April 2 – The first episodes of As the World Turns and The Edge of Night are broadcast on the CBS Television Network in the United States. April 7 – Spain relinquishes its protectorate in Morocco. April 9 – Habib Bourguiba is elected President of the National Constituent Assembly of the Kingdom of Tunisia; on April 15 he becomes Prime Minister. April 14 – Videotape is first demonstrated at the 1956 NARTB (modern-day NAB) convention in Chicago by Ampex. It is the demonstration of the first practical and commercially successful videotape format known as 2" Quadruplex. April 17 – Queen Elizabeth II inaugurates the 4.9 km2 Chew Valley Lake in Somerset, England, as a reservoir for the Bristol area. April 18 – Maria Desylla-Kapodistria is elected mayor of Corfu, becoming the first female mayor in Greece. April 19 British diver Lionel (Buster) Crabb (working for MI6) dives into Portsmouth Harbour, to investigate a visiting Soviet cruiser, and vanishes. American actress Grace Kelly marries Rainier III, Prince of Monaco. The 5.0 1956 Atarfe-Albolote earthquake strikes southern Spain killing 12 and injuring dozens more. April 21 – Former U.S. First Daughter Margaret Truman marries Clifton Daniel. April 27 – Heavyweight boxing champion Rocky Marciano retires, without losing a professional boxing match. May May 1 – Minamata disease is discovered in Japan. May 2 The United Methodist Church in America decides, at its General Conference, to grant