Cite as: 570 U. S. ____ (2013) 11 Opinion of the Court States is essential to the harmonious operation of the scheme upon which the Republic was organized.” Id., at 580. Coyle concerned the admission of new States, and Katzenbach rejected the notion that the principle operated as a bar on differential treatment outside that context. 383 U. S., at 328–329. At the same time, as we made clear in Northwest Austin, the fundamental principle of equal sovereignty remains highly pertinent in assessing subsequent disparate treatment of States. 557 U. S., at 203. The Voting Rights Act sharply departs from these basic principles. It suspends “all changes to state election law— however innocuous—until they have been precleared by federal authorities in Washington, D. C.” Id., at 202. States must beseech the Federal Government for permission to implement laws that they would otherwise have the right to enact and execute on their own, subject of course to any injunction in a §2 action. The Attorney General has 60 days to object to a preclearance request, longer if he requests more information. See 28 CFR §§51.9, 51.37. If a State seeks preclearance from a threejudge court, the process can take years. And despite the tradition of equal sovereignty, the Act applies to only nine States (and several additional counties). While one State waits months or years and expends funds to implement a validly enacted law, its neighbor can typically put the same law into effect immediately, through the normal legislative process. Even if a noncovered jurisdiction is sued, there are important differences between those proceedings and preclearance proceedings; the preclearance proceeding “not only switches the burden of proof to the supplicant jurisdiction, but also applies substantive standards quite different from those governing the rest of the nation.” 679 F. 3d, at 884 (Williams, J., dissenting) (case below). All this explains why, when we first upheld the Act in 1966, we described it as “stringent” and “potent.” Katzen-