18 ALEXANDER v. SOUTH CAROLINA STATE CONFERENCE OF THE NAACP KAGAN, J., dissenting knew they needed to achieve their partisan goal. And when statistics experts reviewed the map, they found that the State’s politics-only story could not explain the redistricting’s extreme racial disparity. In dismissing that strong case, the majority cherry-picks evidence, ignores credibility findings, misunderstands expert views, and substitutes its own statistical theories. Its opinion gives not a whit of respect to the District Court’s factual findings, thus defying the demands of clear-error review. A Start with the State’s chief mapmaker. William Roberts, as the majority notes, was a “nonpartisan staffer with 20 years of experience” drawing maps for Republicans and Democrats alike. Ante, at 8–9. He was good at what he did—expert, “helpful,” and “precise.” J. S. A. 74a, 254a. And also this—he was a veteran consumer of racial data. On cross-examination, Roberts testified as follows: Q: I think I heard the number of 75 to a hundred localities you’ve worked in over the past 20 years? A: Yes. . . . Q: Before this redistricting cycle, you always looked at race data in the 75 to a hundred districts you worked in, correct? A: Yes. . . . Q: Indeed, . . . you provided guidance to localities that they should be looking at BVAP [Black Voting-Age Population] in drawing lines, correct? A: That’s correct. Id., at 204a–205a. The point of looking at BVAP, according to the mapmaker’s testimony, was not to suppress the Black vote. Rather, Roberts stated that he did so to achieve a panoply of lawful districting goals—like assessing Voting Rights Act compliance and “help[ing] the general public understand the race of voters getting moved in and out.” Id.,

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