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Why did people stop duelling? Because shooting people for being rude to you became to be seen as impolite.

Sources:

The Code of Honour and Its Critics: The Opposition to Duelling in England, 1700-1850 by Donna T. Andrew

Courts of Honour in the Late Imperial Russian Army by Paul Robinson

The Double Guilt of Dueling: The Stain of Suicide in Anti-Dueling Rhetoric in the Early Republic by Richard Bell

Why Don’t People Duel Anymore (Short Animated Documentary)