2 ALEXANDER v. SOUTH CAROLINA STATE CONFERENCE OF THE NAACP KAGAN, J., dissenting U. S. 285, 291, and n. 1, 308, n. 7 (2017); Miller v. Johnson, 515 U. S. 900, 914 (1995). So the key question again: In drawing District 1, did the mapmakers consider voting data alone, or did they also closely attend and respond to which residents were Black and which were White? A three-judge District Court undertook to resolve that factual dispute. And the court, over nearly a year, did everything one could ask to carry out its charge. After overseeing broad discovery, the court held a 9-day trial, featuring some two dozen witnesses and hundreds of exhibits. It evaluated evidence about South Carolina geography and politics. It heard first-hand testimony about the redistricting process. And it considered the views of statistical experts on how the State’s new district lines could—and could not— have come about. In the end, the court had to decide between two starkly different stories, backed by opposing bodies of evidence. One side you know from having read the majority opinion: The state officials repeatedly denied using race in choosing the people kicked out of District 1, insisting that they based their decisions on political data alone. The other side you have not yet heard, except in the sketchiest of terms. It is that the State’s mapmakers were experienced and skilled in the use of racial data to draw electoral maps; that they configured their mapmaking software to show how any change made to the district would affect its racial composition; that the racial make-up they landed on was precisely what they needed, to the decimal point, to achieve their partisan goals; and that their politics-only story could not account, as a statistical matter, for their large-scale exclusion of African-American citizens. Faced with that proof, all three judges agreed: The Challengers’ version of events was the more credible. The court, to put the matter bluntly, did not believe the state officials. It thought they had gerrymandered District 1 by race. In reviewing those conclusions, the majority goes seriously wrong. Factfinding about electoral districting, as

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