Cite as: 570 U. S. ____ (2013) 9 Opinion of the Court II In Northwest Austin, we stated that “the Act imposes current burdens and must be justified by current needs.” 557 U. S., at 203. And we concluded that “a departure from the fundamental principle of equal sovereignty requires a showing that a statute’s disparate geographic coverage is sufficiently related to the problem that it targets.” Ibid. These basic principles guide our review of the question before us.1 A The Constitution and laws of the United States are “the supreme Law of the Land.” U. S. Const., Art. VI, cl. 2. State legislation may not contravene federal law. The Federal Government does not, however, have a general right to review and veto state enactments before they go into effect. A proposal to grant such authority to “negative” state laws was considered at the Constitutional Convention, but rejected in favor of allowing state laws to take effect, subject to later challenge under the Supremacy Clause. See 1 Records of the Federal Convention of 1787, pp. 21, 164–168 (M. Farrand ed. 1911); 2 id., at 27–29, 390–392. Outside the strictures of the Supremacy Clause, States retain broad autonomy in structuring their governments and pursuing legislative objectives. Indeed, the Constitution provides that all powers not specifically granted to the Federal Government are reserved to the States or citizens. Amdt. 10. This “allocation of powers in our federal system preserves the integrity, dignity, and residual sovereignty of the States.” Bond v. United States, 564 U. S. ___, ___ —————— 1 Both the Fourteenth and Fifteenth Amendments were at issue in Northwest Austin, see Juris. Statement i, and Brief for Federal Appellee 29–30, in Northwest Austin Municipal Util. Dist. No. One v. Holder, O. T. 2008, No. 08–322, and accordingly Northwest Austin guides our review under both Amendments in this case.

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