Polk is the only US President to have kept all of his campaign promises, including his promise not to seek a second term. His most difficult one was the annexation of the Soutwestern territories from Mexico.
Andrew Jackson helped James Polk's campaign by speaking on his behalf whenever he could. That might have helped Polk become the President of the United States. James Polk was also a good speaker and the fact that he married Sarah Childress-Polk might also have made a difference in his election.
Yes, James K. Polk was the 11th president, and served from 1845-1849. Abraham Lincoln was the 16th president, and served from 1861-1865. James J Polk was the 11 president (1845-1849) Aberham Lincoln was the 16 president (1861-1865)