4 SHELBY COUNTY v. HOLDER Opinion of the Court out” of coverage if it had not used a test or device in the preceding five years “for the purpose or with the effect of denying or abridging the right to vote on account of race or color.” §4(a), id., at 438. In 1965, the covered States included Alabama, Georgia, Louisiana, Mississippi, South Carolina, and Virginia. The additional covered subdivisions included 39 counties in North Carolina and one in Arizona. See 28 CFR pt. 51, App. (2012). In those jurisdictions, §4 of the Act banned all such tests or devices. §4(a), 79 Stat. 438. Section 5 provided that no change in voting procedures could take effect until it was approved by federal authorities in Washington, D. C.— either the Attorney General or a court of three judges. Id., at 439. A jurisdiction could obtain such “preclearance” only by proving that the change had neither “the purpose [nor] the effect of denying or abridging the right to vote on account of race or color.” Ibid. Sections 4 and 5 were intended to be temporary; they were set to expire after five years. See §4(a), id., at 438; Northwest Austin, supra, at 199. In South Carolina v. Katzenbach, we upheld the 1965 Act against constitutional challenge, explaining that it was justified to address “voting discrimination where it persists on a pervasive scale.” 383 U. S., at 308. In 1970, Congress reauthorized the Act for another five years, and extended the coverage formula in §4(b) to jurisdictions that had a voting test and less than 50 percent voter registration or turnout as of 1968. Voting Rights Act Amendments of 1970, §§3–4, 84 Stat. 315. That swept in several counties in California, New Hampshire, and New York. See 28 CFR pt. 51, App. Congress also extended the ban in §4(a) on tests and devices nationwide. §6, 84 Stat. 315. In 1975, Congress reauthorized the Act for seven more years, and extended its coverage to jurisdictions that had a voting test and less than 50 percent voter registration or

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