James-K-Polk-11th-US-President from March 4, 1845 to March 4, 1849, Democratic. Polk had served as Speaker of the House from 1835 to 1839 and Governor of Tennessee from 1839 to 1841 before defeating Henry Clay for president in 1844 with his promise to annex Texas. He was also a prominent leader of Jacksonian Democracy.
PRESIDENT JAMES POLK and his family, with future president JAMES BUCHANAN (far left) together on the South Portico at the White House. The woman to President Polk's left (head blurred) is former FIRST LADY DOLLEY MADISON. -- 1849
11: James k. Polk 1795-1849 Dates in office 1845-1849 Political Party: Democrat: Often referred to as the first "dark horse" Polk was the last of the Jacksonians to sit in the White House, and the last strong President until the Civil War. before he could take office, Congress passed a joint resolution offering annexation to Texas. In so doing they bequeathed Polk the possibility of war with Mexico, which soon severed diplomatic relations..