James K. Polk was the 11th President of the United States, serving from 1845 to 1849, and is best known for his role in expanding U.S. territory through the doctrine of Manifest Destiny. His presidency was marked by significant territorial acquisitions, including the annexation of Texas and the Oregon Territory, as well as the Mexican-American War, which further fueled the belief that the United States was destined to expand across North America.
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