12 ALEXANDER v. SOUTH CAROLINA STATE CONFERENCE OF THE NAACP KAGAN, J., dissenting the “testimony of government officials,” proof about the data available to mapmakers, and “expert analysis”—“[a]n alternative map is merely an evidentiary tool.” Id., at 318– 319. So “neither [a map’s] presence nor its absence can itself resolve a racial gerrymandering claim.” Id., at 319. The majority cannot evade Cooper’s force by casting today’s holding as an “adverse inference” rule rather than a simple requirement. First, there is precious little difference between the two. Given the apparent strength of the majority’s adverse inference, few litigants will feel free to proceed without commissioning alternative maps. The majority’s inference is effectively a requirement, whether or not it goes by that label. And anyway, Cooper’s reasoning easily encompasses—which is to say forbids—the majority’s new inference rule. The point in Cooper was to treat maps equivalently to—rather than “elevate” them above—other forms of evidence. Id., at 318. So if the plaintiff ’s non-map evidence supports a claim, the Court stated, the absence of a map “does not matter.” Ibid. The Cooper dissent well understood the point. No less than three times, the dissent quoted the Court’s “does not matter” line, arguing vociferously that a map’s absence should matter, if not in all cases, at least in all but “exceptional ones.” Id., at 336; see id., at 329, 359. The dissent lost that battle, but now succeeds in overturning the essence of Cooper’s map ruling. The majority-née-dissent’s reasons for elevating maps above other evidence have not improved since Cooper held to the contrary. The majority states that maps can serve as a good way to undermine a State’s “it was all politics” defense. See ante, at 30–31. No argument there: The Cooper Court also said as much. 581 U. S., at 317. But it went on to say that maps “are hardly the only means” of attacking such a defense—as this case well shows. Id., at 318; see infra, at 15–33. The majority also insists that plaintiffs can “easily churn out” alternative maps at “little marginal cost.” Ante, at 30 (quoting, of course, the Cooper dissent). Maybe

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