Adolf Hitler Sentenced
Apr 1 Adolf Hitler sentenced to 5 years labor for "Beer Hall Putsch" but General Ludendorff acquitted
- Apr 1 Crown takes over Northern Rhodesia from British South Africa Co
- Apr 1 Imperial Airways forms in Britain
- Apr 1 The Royal Canadian Air Force is formed.
Topkapi Palace Converted
Apr 3 Istanbul's Ottoman Topkapi Palace is converted into a museum on orders of Mustafa Kemal Atatürk
- 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 10 Tubular steel golf club shafts approved for championship play
- Apr 11 1st men's college swimming championships begin
- 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 Rand McNally publishes its first road atlas.
- Apr 15 WHO-AM in Des Moines Iowa begins radio transmissions
- 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 19 "National Barn Dance" premieres on WLS Chicago
28th Boston Marathon
Apr 21 28th Boston Marathon won by Clarence DeMar for the third consecutive year in 2:29:40.2; 4th race victory
Admirals
Aviators
Gangsters
Generals
Industrialists
Suffragists