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In page 1921:

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  • May 23–July 16 – The Leipzig War Crimes Trials are held in Germany.[6]
  • May 24 – 1921 Irish elections: In the first Northern Ireland general election for the new Parliament of Northern Ireland, Ulster Unionists win 40 out of 52 seats. The dominant-party system here will last for fifty years.[citation needed]
  • May 25 – Irish War of Independence: The Irish Republican Army occupies and burns The Custom House in Dublin, the centre of local government in Ireland. Five IRA men are killed, and over 80 are captured by the British Army which surrounds the building.[7]