Cite as: 570 U. S. ____ (2013) 21 GINSBURG, J., dissenting does not signal a constitutional violation, it is a factor that increases the vulnerability of racial minorities to dis­ criminatory changes in voting law. The reason is twofold. First, racial polarization means that racial minorities are at risk of being systematically outvoted and having their interests underrepresented in legislatures. Second, “when political preferences fall along racial lines, the natural inclinations of incumbents and ruling parties to entrench themselves have predictable racial effects. Under circum­ stances of severe racial polarization, efforts to gain politi­ cal advantage translate into race-specific disadvantages.” Ansolabehere, Persily, & Stewart, Regional Differences in Racial Polarization in the 2012 Presidential Election: Implications for the Constitutionality of Section 5 of the Voting Rights Act, 126 Harv. L. Rev. Forum 205, 209 (2013). In other words, a governing political coalition has an incentive to prevent changes in the existing balance of voting power. When voting is racially polarized, efforts by the ruling party to pursue that incentive “will inevitably discriminate against a racial group.” Ibid. Just as build­ ings in California have a greater need to be earthquake­ proofed, places where there is greater racial polarization in voting have a greater need for prophylactic measures to prevent purposeful race discrimination. This point was understood by Congress and is well recognized in the academic literature. See 2006 Reauthorization §2(b)(3), 120 Stat. 577 (“The continued evidence of racially polar­ ized voting in each of the jurisdictions covered by the [preclearance requirement] demonstrates that racial and language minorities remain politically vulnerable”); H. R. Rep. No. 109–478, at 35; Davidson, The Recent Evolution of Voting Rights Law Affecting Racial and Language Minorities, in Quiet Revolution 21, 22. The case for retaining a coverage formula that met needs on the ground was therefore solid. Congress might

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