The US Supreme Court decision in 1964 was Reynolds v. Sims case.
- The United States Supreme Court made a significant ruling in Reynolds v. Sims, 377 U.S. 533 (1964), mandating that state legislative chamber electoral districts have about equal populations. It was one of many Warren Court rulings, including Baker v. Carr (1962) and Wesberry v. Sanders (1964), that extended the tenet of "one person, one vote" to federal legislative bodies.
- Chief Justice Earl Warren declared that the Equal Protection Clause of the Fourteenth Amendment required states to create state legislative election districts with about equal populations in a majority opinion, which was backed by five other justices. Warren claimed that "Legislators speak for the people, not the acres or the trees. Voters, not farms, cities, or commercial interests, elect lawmakers."
- Associate Justice John Marshall Harlan II stated in his dissenting opinion that the Equal Protection Clause was not intended to cover the freedom to vote. As a result of many states having to alter their representational structure, the ruling had a significant influence on state legislatures.
Thus the answer is Reynolds v. Sims.
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