James Knox Polk served from March 4, 1845 to March 3, 1849. He served for just one 4-year term.
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James Knox Polk is the only US President to have held that office.
James Knox Polk was the 11th President of the United States serving from from March 4, 1845 to March 4, 1849.
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Polk ran and was elected in 1844.