Betty Friedan, whose 1963 book 'The Feminine Mystique' galvanized second-wave feminism, is born in Peoria, Illinois.

Elections for the new parliaments of Northern Ireland and Southern Ireland delivered a landslide to Sinn Féin, hardening the island's partition amid ongoing guerrilla war.

Adolf Hitler assumed absolute leadership of the National Socialist German Workers' Party, crushing internal rivals and securing dictatorial control over the movement.

British and Irish delegates signed the Anglo-Irish Treaty in London, ending the Irish War of Independence and creating the Irish Free State.