Cite as: 518 U. S. 470 (1996)
Opinion of the Court
505 U. S. 88, 111 (1992) (Kennedy, J., concurring in part and concurring in judgment), our interpretation of that language does not occur in a contextual vacuum. Rather, that interpretation is informed by two presumptions about the nature of pre-emption. See ibid.
First, because the States are independent sovereigns in our federal system, we have long presumed that Congress does not cavalierly pre-empt state-law causes of action. In all pre-emption cases, and particularly in those in which Congress has "legislated . . . in a field which the States have traditionally occupied," Rice v. Santa Fe Elevator Corp., 331 U. S. 218, 230 (1947), we "start with the assumption that the historic police powers of the States were not to be superseded by the Federal Act unless that was the clear and manifest purpose of Congress." Ibid.; Hillsborough Cty., 471 U. S., at 715-716; cf. Fort Halifax Packing Co. v. Coyne, 482 U. S. 1, 22 (1987). Although dissenting Justices have argued that this assumption should apply only to the question whether Congress intended any pre-emption at all, as opposed to questions concerning the scope of its intended invalidation of state law, see Cipollone, 505 U. S., at 545-546 (Scalia, J., concurring in judgment in part and dissenting in part), we used a "presumption against the pre-emption of state police power regulations" to support a narrow interpretation of such an express command in Cipollone. Id., at 518, 523. That approach is consistent with both federalism concerns and the historic primacy of state regulation of matters of health and safety.
Second, our analysis of the scope of the statute's preemption is guided by our oft-repeated comment, initially made in Retail Clerks v. Schermerhorn, 375 U. S. 96, 103 (1963), that "[t]he purpose of Congress is the ultimate touch-stone" in every pre-emption case. See, e. g., Cipollone, 505 U. S., at 516; Gade, 505 U. S., at 96; Malone v. White Motor Corp., 435 U. S. 497, 504 (1978). As a result, any understanding of the scope of a pre-emption statute must rest pri-
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