Editing 1956 (section)

=== April ===
{{Main|April 1956}}
[[File:2-inch Quad Tape Reel with miniDV cassette.jpg|thumb|A reel of 2-inch [[quadruplex videotape]] compared with a later [[miniDV]] videocassette.]]
* [[April 7]] – Spain relinquishes [[Spanish protectorate in Morocco|its protectorate in Morocco]].
* [[April 9]] – [[Habib Bourguiba]] is elected [[President of the Assembly of the Representatives of the People|President of the National Constituent Assembly]] of the [[Kingdom of Tunisia]]; on April 15 he becomes [[Head of Government of Tunisia|prime minister]].<ref>{{Cite book|last1=Bessis|first1=Sophie|author-link1=Sophie Bessis|last2=Belhassen|first2=Souhayr|author-link2=Souhayr Belhassen|title=Bourguiba|year=2012|publisher=[[:fr:Éditions Elyzad|Elyzad]]|location=Tunis|isbn=978-9973-58-044-3|language=fr}}</ref>
* [[April 14]] – [[Videotape]] is first demonstrated at the 1956 NARTB (modern-day [[National Association of Broadcasters|NAB]]) convention in Chicago, United States, by [[Ampex]]. It is the demonstration of the first practical and commercially successful [[videotape]] format known as [[Quadruplex videotape|2" Quadruplex]].<ref>{{Cite book|title=Royal Television Society Journal, Volume 18, Issues 7–12|year=1981|pages=14–15}}</ref>
* [[April 18]] 
** American actress [[Grace Kelly]] legally marries [[Rainier III, Prince of Monaco]]; a religious ceremony follows next day.<ref>{{cite magazine|title=The Big Week in Monaco: Movies' Pretty Princess Assumes a Real Life Title|magazine=Life|url=https://books.google.com/books?id=R08EAAAAMBAJ&pg=PA37|volume=40|issue=18|date=April 30, 1956|page=37|issn=0024-3019|quote= 'I'm halfway married,' she exclaimed after the first wedding, a 16-minute civil ceremony in his crimson-damasked throne }}</ref>
** [[Maria Desylla-Kapodistria]] is elected [[mayor]] of [[Corfu (city)|Corfu]], becoming the first female mayor in Greece.
* [[April 19]]
** British [[Underwater diving|diver]] [[Lionel Crabb|Lionel (Buster) Crabb]] (working for [[MI6]]) dives into [[Portsmouth]] Harbour, to investigate a visiting [[Soviet Union|Soviet]] cruiser, and vanishes.
** The 5.0 {{M|w}} [[1956 Atarfe-Albolote earthquake]] strikes southern [[Spain]] killing 12 and injuring dozens more.
* [[April 21]] – Former U.S. [[First Family of the United States|First Daughter]] [[Margaret Truman]] marries [[Clifton Daniel]].
* [[April 27]] – [[Heavyweight]] boxing champion [[Rocky Marciano]] retires, without losing a professional boxing match.