502
Opinion of the Court
provision . . . removing from the citizens of each State the disabilities of alienage in the other States, and giving them equality of privilege with citizens of those States, the Republic would have constituted little more than a league of States; it would not have constituted the Union which now exists"). It provides important protections for nonresidents who enter a State whether to obtain employment, Hicklin v. Orbeck, 437 U. S. 518 (1978), to procure medical services, Doe v. Bolton, 410 U. S. 179, 200 (1973), or even to engage in commercial shrimp fishing, Toomer v. Witsell, 334 U. S. 385 (1948). Those protections are not "absolute," but the Clause "does bar discrimination against citizens of other States where there is no substantial reason for the discrimination beyond the mere fact that they are citizens of other States." Id., at 396. There may be a substantial reason for requiring the nonresident to pay more than the resident for a hunting license, see Baldwin v. Fish and Game Comm'n of Mont., 436 U. S. 371, 390-391 (1978), or to enroll in the state university, see Vlandis v. Kline, 412 U. S. 441, 445 (1973), but our cases have not identified any acceptable reason for qualifying the protection afforded by the Clause for "the 'citizen of State A who ventures into State B' to settle there and establish a home." Zobel, 457 U. S., at 74 (O'Connor, J., concurring in judgment). Permissible justifications for discrimination between residents and nonresidents are simply inapplicable to a nonresident's exercise of the right to move into another State and become a resident of that State.
What is at issue in this case, then, is this third aspect of the right to travel—the right of the newly arrived citizen to the same privileges and immunities enjoyed by other citizens of the same State. That right is protected not only by the new arrival's status as a state citizen, but also by her status as a citizen of the United States.15 That additional source
15 The Framers of the Fourteenth Amendment modeled this Clause upon the "Privileges and Immunities" Clause found in Article IV. Cong. Globe, 39th Cong., 1st Sess., 1033-1034 (1866) (statement of Rep. Bingham). In
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