Presidential elections were held in the United States from October 31 to December 3, 1800. In what is sometimes called the "Revolution of 1800", the Democratic-Republican Party candidate, Vice President Thomas Jefferson, defeated the Federalist Party candidate and incumbent, President John Adams in the second peaceful transfer of power in the history of the United States, creating a political realignment that ushered in a generation of Democratic-Republican leadership. This was the first presidential election in U.S. history to be a rematch, the first election where an incumbent president lost re-election, leading to the first time in modern history where a national government changed hands peaceably following a free election.
Adams had narrowly defeated Jefferson in the 1796 election. Under the rules of the electoral system in place before the 1804 ratification of the Twelfth Amendment to the United States Constitution, each member of the Electoral College cast two votes, with no distinction made between electoral votes for president and electoral votes for vice president. As Jefferson received the second-most votes in 1796, he was elected vice president. In 1800, unlike in 1796, both parties formally nominated tickets. The Democratic-Republicans nominated a ticket consisting of Jefferson and Aaron Burr, while the Federalists nominated a ticket consisting of Adams and Charles Cotesworth Pinckney. Each party formed a plan by which one of their respective electors would vote for a third candidate or abstain so that its preferred presidential candidate (Adams for the Federalists and Jefferson for the Democratic-Republicans) would win one more vote than the party's other nominee.
