20 ALEXANDER v. SOUTH CAROLINA STATE CONFERENCE OF THE NAACP KAGAN, J., dissenting Q: So, if you moved a district line, you could see if the BVAP went up or down, right? A: You could see on the statistics what the overall district BVAP would be. J. S. A. 207a; see J. S. A. Supp. 402a (another staffer acknowledging: “Was I aware of, while I was drawing, what the racial makeup of what I was drawing was? Yes”). So Roberts’s testimony presented a puzzle. As the majority highlights, Roberts consistently denied relying on racial data. See, e.g., ante, at 14–15, 17. But racial data, according to both him and others, was easily accessible—in fact, was usually visible—on his computer while the line-drawing was going on. And he never explained why it was there. Why configure a computer to tell you, at every stage of the mapmaking process, how the slightest change in a district line would affect Black voting-age population if you weren’t tracking and manipulating Black voting-age population? Roberts had no answer. But there was an obvious reason for attending so closely to racial data, as even the majority acknowledges: One surefire way of making a South Carolina district more Republican is to make it less Black. See ante, at 15–16. The difference between a “Republican tilt” and a “Democratic tilt” in District 1, notes the majority, is the difference between a 17% BVAP and a 21% BVAP. Ibid. That is because in recent statewide elections, more than 90% of Black South Carolina voters—and usually more than 95%—have supported the Democratic candidate. See J. S. A. Supp. 82a. In South Carolina, to remove a Black voter from a congressional district is pretty nearly to remove a future Democratic vote. That is no secret. So it is small wonder that racial data was conspicuously displayed on Roberts’s computer. And then small wonder that the District Court found Roberts to have used that data to draw district lines. See 649 F. Supp. 3d, at 191. More doubt would properly have

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