James K. Polk (1845-1849)

Party(Democrat)
James Knox Polk was a college grad.
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A dress that belonged to first lady Sarah Polk. (AP Photo)

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A portrait of James Polk. (AP image)

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James Knox Polk was the only speaker of the house to move into the executive office. (Flickr Commons image)

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James Knox Polk was one of the most effective presidents because he pledged that he would not run for reelection (Flickr Commons image)

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James Polk was the youngest president up to that time, and he was age 49.