Polk, James K. – (Born November 2, 1795; Died natural causes June 15, 1849, North Carolina) Eleventh President of the United States of America, (April 4, 1845 – March 4, 1849) expanded the Country both through war and conquest (of Mexico) adding Arizona, New Mexico, Nevada, and California, as well as negotiation (with Great Britain) adding Oregon and Washington. (Democratic)