Four years. He promised one term and that is what he did. Polk added over 800,000 square miles to western territory and extended the boundary of the country to the Pacific Ocean. He also lowered tariffs and created an independent federal treasury.
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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.
James Knox Polk.
Polk ran and was elected in 1844.
James Knox Polk served from March 4, 1845 to March 3, 1849. He served for just one 4-year term.