8 ALEXANDER v. SOUTH CAROLINA STATE CONFERENCE OF THE NAACP Opinion of the Court population shifts. District 1 was overpopulated by 87,689 residents while District 6 was underpopulated by 84,741 residents. South Carolina therefore had to add voters to District 6 while subtracting voters from District 1 in order to comply with the principle of one person, one vote. The remaining districts also had to be modified in order to bring the whole map into compliance with that requirement. In September 2021, the Senate subcommittee tasked with drawing the new map issued guidance explaining that traditional districting principles, such as respect for contiguity and incumbent protection, would guide the mapmaking process along with the strict equal-population requirement. At the same time, the Republican-controlled legislature also made it clear that it would aim to create a stronger Republican tilt in District 1. Senate Majority Leader Shane Massey, for instance, testified at trial that partisanship was “one of the most important factors” in the process and that the Republican Party was “not going to pass a plan that sacrificed [District 1].” J. S. A. 265a. As he put it, the legislature’s adoption of any map that improved the Democrats’ chance of reclaiming District 1 would constitute “political malpractice.” Id., at 276a. Contemporaneous evidence confirms that leaders in the legislature sought to “create a stronger Republican tilt” in District 1 while “honoring” other race-neutral, traditional districting criteria. 649 F. Supp. 3d 177, 187 (SC 2023); J. S. A. 333a–334a. To draw its maps, the Senate turned to Will Roberts, a nonpartisan staffer with 20 years of experience in state government. Roberts had “worked with the three-judge panel in Backus” and had routinely prepared “reapportionment plans for counties, cities[,] and school boards across the state.” 649 F. Supp. 3d, at 188. During the trial of this case, one of the judges praised Roberts’ expertise and honesty on

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