Who was the last President to run unopposed for reelection in American history?
The United States presidential election of 1820 was the ninth quadrennial presidential election. It was held from Wednesday, November 1, to Wednesday, December 6, 1820. It was the third and last United States presidential election in which a candidate ran effectively unopposed (the previous two unopposed presidential elections were those of 1788–89 and 1792, in which George Washington ran without serious opposition).
President James Monroe and Vice President Daniel D. Tompkins were re-elected effortlessly and captured all but one electoral vote. The failing Federalist Party did participate in the election of 1820 by fielding a serious vice-presidential candidate (Richard Stockton), but was unable to nominate a national candidate for president. It was never able to participate again in any federal election.