14 ALEXANDER v. SOUTH CAROLINA STATE CONFERENCE OF THE NAACP Opinion of the Court fect what is labeled a finding of fact. “[I]f [a] trial court bases its findings upon a mistaken impression of applicable legal principles, the reviewing court is not bound by the clearly erroneous standard.” Inwood Laboratories, Inc. v. Ives Laboratories, Inc., 456 U. S. 844, 855, n. 15 (1982); see also Abbott, 585 U. S., at 607. Here, the standard of proof that the three-judge court was required to apply, i.e., the racial-predominance test, has a very substantial legal component that must take account of our prior relevant decisions. 6 And the application of this test calls for particular care when the defense contends that the driving force in its critical districting decisions (namely, partisanship) was a factor that is closely correlated with race. Thus, in a case like this, we must exercise special care in reviewing the relevant findings of fact. B The District Court found that South Carolina drew District 1 with a racial “target,” namely, the maintenance of a 17% BVAP, and it concluded that this deliberate use of race rendered District 1’s lines unlawful. See Bethune-Hill, 580 U. S., at 183–185. But the Challengers did not offer any direct evidence to support that conclusion, and indeed, the direct evidence that is in the record is to the contrary. Rob—————— 6 The dissent is correct to note that it is not enough for a plaintiff to show that race was a mere factor in the State’s redistricting calculus. Rather, the plaintiff must show that race played a “ ‘predominant’ ” role in shaping a district’s lines. Post, at 17, n. 4 (opinion of KAGAN, J.) (quoting Miller, 515 U. S., at 916). But the dissent then retreats from this standard because the State denied relying at all on racial data. Post, at 17, n. 4. That is a puzzling argument. Parties can stipulate to issues of fact, but they cannot by stipulation amend the law. See, e.g., United States Natl. Bank of Ore. v. Independent Ins. Agents of America, 508 U. S. 439, 447 (1993). And it would be uniquely perverse to deprive the State of a more generous constitutional standard simply because it made the laudable effort to disregard race altogether in the redistricting process.

Select target paragraph3