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-James Knox Polk (November 2, 1795 – June 15, 1849) was the 11th President of the United States (1845–1849). He previously was Speaker of the House of Representatives (1835–1839) and Governor of Tennessee (1839–1841). A protégé of Andrew Jackson, he was a member of the Democratic Party and an advocate of Jacksonian democracy. During Polk\'s presidency, the United States expanded significantly with the annexation of the Republic of Texas, the Oregon Territory, and the Mexican Cession following the 美国艺术家 victory in the Mexican–美国艺术家 War.