What was the corrupt bargain of 1824?

Corrupt bargain was a factor in the election of John Quincy Adams. During the election of 1824 between William Crawford, John Adams, Henry Clay, and Andrew Jackson, Jackson had won the most popular votes and electoral votes.

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A simple answer is this,
corrupt bargain:
alleged deal between presidential candidates John Q. Adams and Henry Clay to throw the election, to be decided by the house of representatives, in Adam's favor. Though never proven, the accusation became the rallying cry for Jackson supporters, who had been majority of the popular vote.