4 ALEXANDER v. SOUTH CAROLINA STATE CONFERENCE OF THE NAACP THOMAS, J., concurring in part partisan gerrymandering claims, the racial gerrymandering and vote dilution claims in this case lack “judicially discoverable and manageable standards” for their resolution. Vieth, 541 U. S., at 277–278 (internal quotation marks omitted). And, they ask us to address an issue—congressional districting—that is textually committed to a coordinate political department, Congress. Id., at 277. As a result, racial gerrymandering and vote dilution claims brought under the Fourteenth and Fifteenth Amendments are nonjusticiable. A Racial gerrymandering and vote dilution claims lack “ ‘judicially discoverable and manageable standards’ ” for their resolution. Id., at 277–278 (quoting Baker, 369 U. S., at 217). Both types of claims turn on questions that cannot be answered through the kind of reasoning that constitutes an exercise of the “judicial Power.” Art. III, §1, cl. 1. I address in turn the reasons why each claim is unmanageable. 1 Racial gerrymandering claims ask courts to reverseengineer the purposes behind a complex and often arbitrary legislative process. The standard developed under our precedents “require[s] the plaintiff to show that race was the ‘predominant factor motivating the legislature’s decision to place a significant number of voters within or without a particular district.’ ” Ante, at 2 (quoting Miller, 515 U. S., at 916). In other words, “a plaintiff must prove that the legislature subordinated traditional race-neutral districting principles . . . to racial considerations.” Id., at 916. The Court’s focus on legislative purpose is unavoidable because “the constitutional violation in racial gerrymandering cases stems from the racial purpose of state action,” not the resulting map. Bethune-Hill v. Virginia State Bd. of Elections, 580 U. S. 178, 189 (2017) (internal quotation marks

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