I think it is Harding by a blowout. Teapot Dome and all of the corruption. He was a complete moron who let his friends run the country like monkeys.
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Hoover. On paper, he was the perfect American: a poor orphan who fought his way into college, then made millions in industry. The fact that he could seem so great, then absolutely tank the nation's economy without even knowing what he was doing, shows a special kind of incompetence.