- Treaty of Versailles: Australia gained League of Nations mandate over German New Guinea.
- Influenza epidemic spreads around the world.
- First trans-Atlantic flight: British aviators John Alcock and Arthur Brown fly non-stop across the Atlantic in a Vickers-Vimy biplane. The 3,154 km flight from Newfoundland to Ireland took 16 hours 12 minutes at an average speed of 120 mph.
- Russia invaded by British, US and other foreign troops supporting anti-Communists.