Events in History
- Apr 1 Crown takes over Northern Rhodesia from British South Africa Co
Coup d'état
Apr 1 Hitler sentenced to 5 years labor for "Beer Hall Putsch" but General Ludendorff acquitted

Adolf Hitler

Erich Ludendorff
- Apr 1 Imperial Airways forms in Britain
- Apr 1 The Royal Canadian Air Force is formed.
- Apr 6 4 planes leave Seattle on 1st successful around-the-world flight
- Apr 6 Italy fascists receives 65% of vote of parliament
- Apr 6 Völkische Block (Nazis) receives 17.8% of vote in Bavaria
- Apr 8 South African State pass the Industrial Conciliation Act No 11: provides for job reservation, excluded blacks from membership of registered trade unions, prohibited registration of black trade unions
- Apr 11 Socialists win Danish parliamentary elections
- Apr 11 WLS-AM in Chicago IL begins radio transmissions
- Apr 12 WLS-AM in Chicago begins radio transmissions
- Apr 13 Greek plebiscite for a republic
- Apr 15 Flemish-Walloon riots in Louvain, Belgium, 1 dead
- Apr 15 WHO-AM in Des Moines Iowa begins radio transmissions
- Apr 15 Rand McNally publishes its first road atlas.
- Apr 16 1st radio-transmission of wireless: Mattheus Passion
- Apr 16 Child labor laws strengthened in Holland
- Apr 17 Metro Pictures, Goldwyn Pictures & Louis B Mayer Co merged to form Metro Goldwyn Mayer (MGM)
- Apr 18 1st crossword puzzle book published by Simon & Schuster
- Apr 22 Hague Chambers of Commerce forms
- Apr 23 British Empire Exhibition opens at Wembley
- Apr 28 119 die in coal mine disaster at Benwood, West Virginia
Birthdays in History
- Apr 1 Brendan Byrne, Governor of New Jersey
- Apr 2 Denis Rooke, British engineer and CEO (British Gas), born in New Cross, London (d. 2008)
- Apr 3 Canon A D Caesar, Sub Dean (HM Chapels Royal)
- Apr 4 Chris Prater, English screenprinter, born in London (d. 1996)
- Apr 5 Mart Kempers, Dutch graphic artist and sculptor, born in Enschede, Netherlands (d. 1993)
- Apr 7 Johannes Mario Simmel, Austrian writer
- Apr 8 Sir Anthony Farrar-Hockley, English soldier and historian (d. 2006)
- Apr 10 Kenneth Noland, American Color Field painter, born in Asheville, North Carolina (d. 2010)
- Apr 12 Julius Moormann, Dutch student and resistance fighter (WWII), born in Nijmegen, Netherlands (d. 1944)
- Apr 12 Peter Safar, Austrian physician (pioneered cardiopulmonary resuscitation or CPR), born in Vienna, Austria (d. 2003)
- Apr 15 John Grigg, 2nd Baron Altrincham, British writer and historian, born in Westminster, London (d. 2001)
- Apr 16 Geoffrey Johnson Smith, Scottish Conservative politician (1959-2001), born in Glasgow, Lanarkshire, Scotland (d. 2010)
- Apr 16 John Harvey-Jones, English businessman and chairman of ICI (1982-87), born in Hackney, London (d. 2008)
- Apr 17 Patrick Sergeant, British investor and founder (Euromoney Publications)
- Apr 17 Althea Simmons, American human rights activist and chief lobbyist (NAACP), born in Shreveport, Louisiana (d. 1990)
- Apr 18 Henry Hyde, American politician (Rep-R-Illinois 1975-2007), born in Chicago, Illinois (d. 2007)
- Apr 18 Roy Mason [Baron Mason of Barnsley], British defense secretary and Labour MP, born in Royston, England (d. 2015)
- Apr 18 Raf de Linde [Raphael van Hecke], author (Vaarwel on Gertrude), born in Evergem, Belgium
- Apr 20 Paul Van Buren, American theologist (Theological Explorations), born in Norfolk, Virginia (d. 1998)
- Apr 21 Daniel Melnick, American producer, Get Smart), born in NYC, New York
- Apr 23 Colin Welch, British political journalist and critic of Enid Blyton's Noddy series, born in Ickleton Abbey, Cambridgeshire (d. 1997)
- Apr 24 Clement Freud, British writer, radio personality, and politician, born in Berlin, Germany (d. 2009)
- Apr 28 Kenneth Kaunda, 1st President of Zambia (1964-91), born in Chinsali, Northern Rhodesia (now Zambia)
Deaths in History
- Apr 2 Johannes Eugenius Bülow Warming, Danish botanist (plant ecology, environment-organism interactions), dies at 82
Louis Sullivan
Apr 14 Louis Sullivan, American architect (father of skyscrapers), dies at 67

Louis Sullivan