Which court case mandates that both houses of a state legislature represent the population on a one-person, one-vote basis?

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Reynolds v. Sims (1964) is the court case that mandates that both houses of a state legislature represent the population on a one-person, one-vote basis. It established the principle of "one person, one vote" in state legislative districts, requiring that each legislative district have roughly the same population so that each citizen's vote would carry equal weight.

Which Court Case Mandates That Both Houses of a State