What system did the direct primary replace?
candidate selection by secret ballots
candidate selection by machine bosses
candidate selection by convention delegates
an indirect primary

  Candidate selection by convention delegates.

Explanation:

  The direct primary system is a process by which people can indicate their preference for a candidate in an upcoming election.

   It was first used in the United States with the purpose of taking the power of selecting candidates from the party leaders back to the people.

  I hope this answer helps you.

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