560
Opinion of the Court
pends largely upon common understanding of what activities are appropriate to legislatures, to executives, and to courts. In The Federalist No. 48, Madison expressed the view that "[i]t is not infrequently a question of real nicety in legislative bodies whether the operation of a particular measure will, or will not, extend beyond the legislative sphere," whereas "the executive power [is] restrained within a narrower compass and . . . more simple in its nature," and "the judiciary [is] described by landmarks still less uncertain." The Federalist No. 48, p. 256 (Carey and McClellan eds. 1990). One of those landmarks, setting apart the "Cases" and "Controversies" that are of the justiciable sort referred to in Article III—"serv[ing] to identify those disputes which are appropriately resolved through the judicial process," Whitmore v. Arkansas, 495 U. S. 149, 155 (1990)—is the doctrine of standing. Though some of its elements express merely prudential considerations that are part of judicial self-government, the core component of standing is an essential and unchanging part of the case-or-controversy requirement of Article III. See, e. g., Allen v. Wright, 468 U. S. 737, 751 (1984).
Over the years, our cases have established that the irreducible constitutional minimum of standing contains three elements. First, the plaintiff must have suffered an "injury in fact"—an invasion of a legally protected interest which is (a) concrete and particularized, see id., at 756; Warth v. Seldin, 422 U. S. 490, 508 (1975); Sierra Club v. Morton, 405 U. S. 727, 740-741, n. 16 (1972); 1 and (b) "actual or imminent, not 'conjectural' or 'hypothetical,' " Whitmore, supra, at 155 (quoting Los Angeles v. Lyons, 461 U. S. 95, 102 (1983)). Second, there must be a causal connection between the injury and the conduct complained of—the injury has to be "fairly . . . trace[able] to the challenged action of the defendant, and not . . . th[e] result [of] the independent action of some third party not before the court." Simon v. Eastern Ky. Welfare
1 By particularized, we mean that the injury must affect the plaintiff in a personal and individual way.
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