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6 state laws. See Art. VI, cl. 2. But everyone also agrees that we have nothing like that here. Despite the persistent efforts of certain pork producers, Congress has yet to adopt any statute that might displace Proposition 12 or laws regulating pork production in other States. See, e.g., H. R. 272, 116th Cong., 1st Sess., §2 (2019); H. R. 4879, 115th Cong., 2d Sess., §2(a) (2018); H. R. 3599, 115th Cong., 1st Sess., §2(a) (2017); H. R. 687, 114th Cong., 1st Sess., §2(a) (2015).

That has led petitioners to resort to litigation, pinning their hopes on what has come to be called the dormant Commerce Clause. Reading between the Constitution’s lines, petitioners observe, this Court has held that the Commerce Clause not only vests Congress with the power to regulate interstate trade; the Clause also “contain[s] a further, negative command,” one effectively forbidding the enforcement of “certain state [economic regulations] even when Congress has failed to legislate on the subject.” Oklahoma Tax Comm’n v. Jefferson Lines, Inc., 514 U. S. 175, 179 (1995).

This view of the Commerce Clause developed gradually. In Gibbons v. Ogden, Chief Justice Marshall recognized that the States’ constitutionally reserved powers enable them to regulate commerce in their own jurisdictions in ways sure to have “a remote and considerable influence on commerce” in other States. 9 Wheat. 1, 203 (1824). By way of example, he cited “[i]nspection laws, quarantine laws, [and] health laws of every description.” Ibid. At the same time, however, Chief Justice Marshall saw “great force in th[e] argument” that the Commerce Clause might impliedly bar certain types of state economic regulation. Id., at 209. Decades later, in Cooley v. ''Board of Wardens of Port of Philadelphia ex rel. Soc. for Relief of Distressed Pilots'', this Court again recognized that the power vested in Congress to regulate interstate commerce leaves the States substantial leeway to adopt their own commercial codes. 12 How. 299, 317–321 (1852). But once more, the Court hinted that the Constitution may come with some restrictions on what