Out of necessity, party-based congressional nominating caucuses were established in the early 19th century. The only national gatherings of party leaders were in the Senate and House of Representatives.
As a result, choosing the candidates for president fell naturally under the purview of each party's congressional caucus.
Jackson's supporters charged Adams and Henry Clay with striking a "corrupt agreement" in which Clay assisted Adams in winning the presidential election in exchange for the position of Secretary of State. This accusation came out after the election.
Adams was vilified by him as a "aristocrat." What notable aspects of Jackson's election? His victory brought back the two-party system. The first "president of the people," he was.
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