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In page 1921:

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  • May 26 – A general strike begins in Norway, begun by 120,000 workers led by Ole O. Lian.[8]
  • May 31–June 1 – Tulsa Race Massacre (Greenwood Massacre): Mobs of white residents attack black residents and businesses in Greenwood District, Tulsa, Oklahoma. The official death toll is 36, but later investigations suggest an actual figure between 100 and 300. 1,250 homes are destroyed and roughly 6,000 African Americans imprisoned in one of the worst incidents of mass racial violence in the United States.[citation needed]