Cite as: 602 U. S. ____ (2024) 25 THOMAS, J., concurring in part uity,” not the flexible power to invent whatever new remedies may seem useful at the time. Grupo Mexicano, 527 U. S., at 319. Redistricting remedies rest on the same questionable understanding of equitable power. No court has explained where the power to draw a replacement map comes from, but all now assume it may be exercised as a matter of course. The most consideration this Court has given to the question, if it can be called consideration, was in Reynolds v. Sims, 377 U. S. 533. In that case, the Court foreswore any attempt to “consider . . . the difficult question of the proper remedial devices which federal courts should utilize in state legislative reapportionment cases,” but nonetheless upheld, as an act of “proper judicial restraint,” the District Court “ordering its own temporary reapportionment plan.” Id., at 585–586. The Court’s only support for that conclusion was the naked statement in Justice Douglas’s Baker concurrence that “ ‘any relief accorded can be fashioned in the light of well-known principles of equity.’ ” Reynolds, 377 U. S., at 585 (quoting 369 U. S., at 250). Douglas’s statement is an obvious fallback to the “practical flexibility” extolled as a “traditional attribut[e] of equity power” in Brown II. 349 U. S., at 300. The explanation is wholly inadequate; the Court has never attempted to ground the map-drawing power in “the jurisdiction in equity exercised by the High Court of Chancery in England” in 1789. Grupo Mexicano, 527 U. S., at 318 (internal quotation marks omitted). The lack of a historically grounded map-drawing remedy is an enormous problem for districting claims, because no historically supportable remedy can correct an improperly drawn district. The most promising option is “[t]he negative injunction remedy against state officials countenanced in Ex parte Young,” a “standard tool of equity that federal courts have authority to entertain under their traditional equitable jurisdiction.” Whole Woman’s Health v. Jackson, 595 U. S. 30, 53 (2021) (THOMAS, J., concurring in part and

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