James BuchananFrom Wikipedia, the free encyclopediaJump to navigationJump to searchThis article is about the 15th President of the United States. For other people, see James Buchanan (disambiguation). James Buchanan15th President of the United StatesIn office March 4, 1857 – March 4, 1861Vice PresidentJohn C. BreckinridgePreceded byFranklin PierceSucceeded byAbraham LincolnUn..