John K. Polk

John K. Polk was the 11th President of the United States, serving from 1845 to 1849. A member of the Democratic Party, he is best known for his expansionist policies, which included the annexation of Texas and the acquisition of Oregon and California following the Mexican-American War. Polk's presidency is often characterized by his commitment to Manifest Destiny, the belief that the expansion of the United States across the American continents was both justified and inevitable. Despite his successes in territorial expansion, Polk was a controversial figure due to his support of slavery and his assertive foreign policy. He chose not to seek re-election after a single term, leaving office in 1849.