- Jun 1 Royal Ulster Constabulary is founded
Event of Interest
Jun 1 Over 50,000 Fascists gather for a meeting in Bologna where Mussolini warns that he will lead a full-scale revolt against a government favoring 'anti-Fascist reaction'
Benito Mussolini
- Jun 2 Suffy McInnis (1st base) ends an errorless string of 1,700 chances
- Jun 5 The Banker's committee of the Reparations Commission refuses an international loan to Germany
- Jun 9 First ringing of the Harkness Memorial Chime at Yale University
- Jun 12 German Reich president Friedrich Ebert visits Munich
- Jun 13 Longest recorded attack of hiccups begins: Charlie Osborne gets the hiccups and continues for 68 years, dies 11 months after it stops
Event of Interest
Jun 14 US President Warren G. Harding is 1st US President to use radio, dedicates the Francis Scott Key memorial in Baltimore
Warren G. Harding
- Jun 16 Henry Berliner demonstrates his helicopter to US Bureau of Aeronautics
- Jun 16 Irish republicans are beaten in a national election; the vote is in favor of the Treaty of London, which leaves the Irish Free State as a dominion within the British Commonwealth
- Jun 22 Herrin massacre, 19 strikebreakers and 2 union miners are killed in Herrin, Illinois.
Event of Interest
Jun 24 Adolf Hitler begins a month long prison sentence for paramilitary operations; he rails against the 'Jewish sell-out' of Germany to the Bolsheviks
Adolf Hitler
- Jun 26 The emergency decrees under Article 48 of the Weimar Constitution are invoked by the government to deal with deteriorating economic conditions
- Jun 27 Newberry Medal 1st presented for kids literature (Hendrik Van Loon)
- Jun 28 The Irish Civil War starts when Irish Free State forces attack anti-treaty republicans in Dublin
- Jun 29 France grants 1 km² at Vimy Ridge "freely, and for all time, to the Government of Canada, the free use of the land exempt from all taxes."