21. Massachusetts: Rocky Marciano (Brockton)
The “Brockton Blockbuster” was known for his relentless fighting style, granite chin, and a devastating right-hand punch he dubbed the “Suzie Q.” Despite being small for a heavyweight and starting his boxing career relatively late, Marciano bulldozed his way through the division. He held the heavyweight championship from 1952 to 1956 and retired with a perfect, unblemished professional record of 49-0, a feat that remains legendary in boxing history.