In 1820, President Monroe Effectively Ran Unopposed“With few exceptions, such as the financial panic of 1819 and the ongoing dilemma over the status of slavery in new states and territories (which was temporarily resolved by the Missouri Compromise), James Monroe’s first term as president was characterized by a pronounced lack of conflict or disruption. In fact, the generally complacent and unified mood of the United States in the prosperous years following the War of 1812 became popularly known as the Era of Good Feelings. Accordingly, Monroe’s renomination in 1820 was considered so inevitable that it was not even formalized; after the congressional caucus of Democratic-Republicans failed to produce a quorum to put forward the nomination, it was simply assumed that Monroe and Vice Pres. Daniel D. Tompkins would again constitute the party’s ticket. Meanwhile, the Federalist Party , which had fared poorly in the previous election, continued its disintegration on the national level by declining to endorse a single presidential candidate, a development that all but assured Monroe’s reelection.”
…“Unsurprisingly, Monroe carried all 24 states in the Union, though he was deprived of a unanimous victory in the electoral college by an elector from New Hampshire, who cast a lone dissenting vote for Secretary of State John Quincy Adams .”
https://www.britannica.com/event/United-States-presidential-election-of-1820