Cite as: 570 U. S. ____ (2013) 5 GINSBURG, J., dissenting surely has not eliminated all vestiges of discrimination against the exercise of the franchise by minority citizens. Jurisdictions covered by the preclearance requirement continued to submit, in large numbers, proposed changes to voting laws that the Attorney General declined to ap­ prove, auguring that barriers to minority voting would quickly resurface were the preclearance remedy elimi­ nated. City of Rome v. United States, 446 U. S. 156, 181 (1980). Congress also found that as “registration and voting of minority citizens increas[ed], other measures may be resorted to which would dilute increasing minority voting strength.” Ibid. (quoting H. R. Rep. No. 94–196, p. 10 (1975)). See also Shaw v. Reno, 509 U. S. 630, 640 (1993) (“[I]t soon became apparent that guaranteeing equal access to the polls would not suffice to root out other racially discriminatory voting practices” such as voting dilution). Efforts to reduce the impact of minority votes, in contrast to direct attempts to block access to the bal­ lot, are aptly described as “second-generation barriers” to minority voting. Second-generation barriers come in various forms. One of the blockages is racial gerrymandering, the redrawing of legislative districts in an “effort to segregate the races for purposes of voting.” Id., at 642. Another is adoption of a system of at-large voting in lieu of district-by-district voting in a city with a sizable black minority. By switch­ ing to at-large voting, the overall majority could control the election of each city council member, effectively elimi­ nating the potency of the minority’s votes. Grofman & Davidson, The Effect of Municipal Election Structure on Black Representation in Eight Southern States, in Quiet Revolution in the South 301, 319 (C. Davidson & B. Grofman eds. 1994) (hereinafter Quiet Revolution). A similar effect could be achieved if the city engaged in discriminatory annexation by incorporating majority­ white areas into city limits, thereby decreasing the effect

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