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The Smartest U.S. Presidents According To Their IQ Score

19. James Polk (IQ 143.4)

Image: Miller Center

A member of the Democratic Party, former President James Polk is considered one of the last strong presidents before the Civil War. With an IQ of 143.4, Polk was the 11th president of the United States and best known for his territorial expansion of the U.S. through the Mexican-American War.

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