opinion: Justice Marshall
  delivered the opinion of the Court.
  We granted certiorari in this case to determine whether the Parental Kidnaping Prevention Act of 1980, 28 U. S. C. § 1738A, furnishes an implied cause of action in federal court to determine which of two conflicting state custody decisions is valid.
  I
  The Parental Kidnaping Prevention Act (PKPA or Act) imposes a duty on the States to enforce a child custody determination entered by a court of a sister State if the determination is consistent with the provisions of the Act. In order for a state court’s custody decree to be consistent with the provisions of the Act, the State must have jurisdiction under its own local law and one of five conditions set out in § 1738A(c)(2) must be met. Briefly put, these conditions authorize the state court to enter a custody decree if the child’s home is or recently has been in the State, if the child has no home State and it would be in the child’s best interest for the State to assume jurisdiction, or if the child is present in the State and has been abandoned or abused. Once a State exercises jurisdiction consistently with the provisions of the Act, no other State may exercise concurrent jurisdiction over the custody dispute, § 1738A(g), even if it would have been empowered to take jurisdiction in the first instance, and all States must accord full faith and credit to the first State’s ensuing custody decree.
  As the legislative scheme suggests, and as Congress explicitly specified, one of the chief purposes of the PKPA is to “avoid jurisdictional competition and conflict between State courts.” Pub. L. 96-611, 94 Stat. 3569, § 7(c)(5), note following 28 U. S. C. § 1738A. This case arises out of a jurisdictional stalemate that came to pass notwithstanding the strictures of the Act. In July 1978, respondent Susan Clay (then Susan Thompson) filed a petition in Los Angeles Superior Court asking the court to dissolve her marriage to petitioner David Thompson and seeking custody of the couple’s infant son, Matthew. The court initially awarded the parents joint custody of Matthew, but that arrangement became infeasible when respondent decided to move from California to Louisiana to take a job. The court then entered an order providing that respondent would have sole custody of Matthew once she left for Louisiana. This state of affairs was to remain in effect until the court investigator submitted a report on custody, after which the court intended to make a more studied custody determination. See App. 6.
  Respondent and Matthew moved to Louisiana in December 1980. Three months later, respondent filed a petition in Louisiana state court for enforcement of the California custody decree, judgment of custody, and modification of petitioner’s visitation privileges. By order dated April 7, 1981, the Louisiana court granted the petition and awarded sole custody of Matthew to respondent. Two months later, however, the California court, having received and reviewed its investigator’s report, entered an order awarding sole custody of Matthew to petitioner. Thus arose the current impasse.
  In August 1983, petitioner brought this action in the District Court for the Central District of California. Petitioner requested an order declaring the Louisiana decree invalid and the California decree valid, and enjoining the enforcement of the Louisiana decree. Petitioner did not attempt to enforce the California decree in a Louisiana state court before he filed suit in federal court. The District Court granted respondent’s motion to dismiss the complaint for lack of subject-matter and personal jurisdiction. Civ. Action No. 88-5221 (Apr. 10, 1984). The Court of Appeals for the Ninth Circuit affirmed. Although it disagreed with the District Court’s jurisdictional analyses, the Court of Appeals affirmed the dismissal of the complaint on the ground that petitioner had failed to state a claim upon which relief could be granted. 798 F. 2d 1547 (1986). Canvassing the background, language, and legislative history of the PKPA, the Court of Appeals held that the Act does not ere-ate a private right of action in federal court to determine the validity of two conflicting custody decrees. Id., at 1552-1559. We granted certiorari, 479 U. S. 1063 (1987), and we now affirm.
  II
  In determining whether to infer a private cause of action from a federal statute, our focal point is Congress’ intent in enacting the statute. As guides to discerning that intent, we have relied on the four factors set out in Cort v. Ash, 422 U. S. 66, 78 (1975), along with other tools of statutory construction. See Daily Income Fund, Inc. v. Fox, 464 U. S. 523, 535-536 (1984); California v. Sierra Club, 451 U. S. 287, 293 (1981); Touche Ross & Co. v. Redington, 442 U. S. 560, 575-576 (1979). Our focus on congressional intent does not mean that we require evidence that Members of Congress, in enacting the statute, actually had in mind the creation of a private cause of action. The implied cause of action doctrine would be a virtual dead letter were it limited to correcting drafting errors when Congress simply forgot to codify its evident intention to provide a cause of action. Rather, as an implied cause of action doctrine suggests, “the legislative history of a statute that does not expressly create or deny a private remedy will typically be equally silent or ambiguous on the question.” Cannon v. University of Chicago, 441 U. S. 677, 694 (1979). We therefore have recognized that Congress’ “intent may appear implicitly in the language or structure of the statute, or in the circumstances of its enactment.” Transamerica Mortgage Advisors, Inc. v. Lewis, 444 U. S. 11, 18 (1979). The intent of Congress remains the ultimate issue, however, and “unless this congressional intent can be inferred from the language of the statute, the statutory structure, or some other source, the essential predicate for implication of a private remedy simply does not exist.” Northwest Airlines, Inc. v. Transport Workers, 451 U. S. 77, 94 (1981). In this case, the essential predicate for implication of a private remedy plainly does not exist. None of the factors that have guided our inquiry in this difficult area points in favor of inferring a private cause of action. Indeed, the context, language, and legislative history of the PKPA all point sharply away from the remedy petitioner urges us to infer.
  We examine initially the context of the PKPA with an eye toward determining Congress’ perception of the law that it was shaping or reshaping. See Merrill Lynch, Pierce, Fenner & Smith, Inc. v. Curran, 456 U. S. 353, 378 (1982); Cort v. Ash, supra, at 69. At the time Congress passed the PKPA, custody orders held a peculiar status under the full faith and credit doctrine, which requires each State to give effect to the judicial proceedings of other States, see U. S. Const., Art. IV, § 1; 28 U. S. C. § 1738. The anomaly traces to the fact that custody orders characteristically are subject to modification as required by the best interests of the child. As a consequence, some courts doubted whether custody orders were sufficiently “final” to trigger full faith and credit requirements, see, e. g., Hooks v. Hooks, 771 F. 2d 935, 948 (CA6 1985); McDougald v. Jenson, 596 F. Supp. 680, 684-685 (ND Fla. 1984), aff’d, 786 F. 2d 1465 (CA11), cert. denied, 479 U. S. 860 (1986), and this Court had declined expressly to settle the question. See Ford v. Ford, 371 U. S. 187, 192 (1962). Even if custody orders were subject to full faith and credit requirements, the Full Faith and Credit Clause obliges States only to accord the same force to judgments as would be accorded by the courts of the State in which the judgment was entered. Because courts entering custody orders generally retain the power to modify them, courts in other States were no less entitled to change the terms of custody according to their own views of the child’s best interest. See New York ex rel. Halvey v. Halvey, 330 U. S. 610, 614-615 (1947). For these reasons, a parent who lost a custody battle in one State had an incentive to kidnap the child and move to another State to relitigate the issue. This circumstance contributed to widespread jurisdictional deadlocks like this one, and more importantly, to a national epidemic of parental kidnaping. At the time the PKPA was enacted, sponsors of the Act estimated that between 25,000 and 100,000 children were kidnaped by parents who had been unable to obtain custody in a legal forum. See Parental Kidnaping Prevention Act of 1979: Joint Hearing on S. 105 before the Subcommittee on Criminal Justice of the Judiciary Committee and the Subcommittee on Child and Human Development of the Committee on Labor and Human Resources, 96th Cong., 2d Sess., 10 (1980) (hereinafter PKPA Joint Hearing) (statement of Sen. Malcolm Wallop).
  A number of States joined in an effort to avoid these jurisdictional conflicts by adopting the Uniform Child Custody Jurisdiction Act (UCCJA), 9 U. L. A. §§ 1-28 (1979). The UCCJA prescribed uniform standards for deciding which State could make a custody determination and obligated enacting States to enforce the determination made by the State with proper jurisdiction. The project foundered, however, because a number of States refused to enact the UCCJA while others enacted it with modifications. In the absence of uniform national standards for allocating and enforcing custody determinations, noncustodial parents still had reason to snatch their children and petition the courts of any of a number of haven States for sole custody.
  The context of the PKPA therefore suggests that the principal problem Congress was seeking to remedy was the inapplicability of full faith and credit requirements to custody determinations. Statements made when the Act was introduced in Congress forcefully confirm that suggestion. The sponsors and supporters of the Act continually indicated that the purpose of the PKPA was to provide for nationwide enforcement of custody orders made in accordance with the terms of the UCCJA. As Acting Deputy Attorney General Michel testified:
  “[CJurrent law in many States encourages a parent who does not have custody to snatch the child from the parent who does and take the child to another State to relitigate the custody issue in a new forum. This kind of ‘forum shopping’ is possible because child custody orders are subject to modification to conform with changes in circumstances. Consequently, a court deciding a custody case is not, as a Federal constitutional requirement of the full faith and credit clause, bound by a decree by a court of another State even where the action involves the same parties.
  “In essence [the PKPA] would impose on States a Federal duty, under enumerated standards derived from the UCCJA, to give full faith and credit to the custody decrees of other States. Such legislation would, in effect, amount to Federal adoption of key provisions of the UCCJA for all States and would eliminate the incentive for one parent to remove a minor child to another jurisdiction.” PKPA Joint Hearing 48.
  The significance of Congress’ full faith and credit approach to the problem of child snatching is that the Full Faith and Credit Clause, in either its constitutional or statutory incarnations, does not give rise to an implied federal cause of action. Minnesota v. Northern Securities Co., 194 U. S. 48, 72 (1904); see 13B C. Wright, A. Miller, & E. Cooper, Federal Practice and Procedure §3563, p. 50 (1984). Rather, the Clause “only prescribes a rule by which courts, Federal and state, are to be guided when a question arises in the progress of a pending suit as to the faith and credit to be given by the court to the public acts, records, and judicial proceedings of a State other than that in which the court is sitting.” Northern Securities, supra, at 72. Because Congress’ chief aim in enacting the PKPA was to extend the requirements of the Full Faith and Credit Clause to custody determinations, the Act is most naturally construed to furnish a rule of decision for courts to use in adjudicating custody disputes and not to create an entirely new cause of action. It thus is not compatible with the purpose and context of the legislative scheme to infer a private cause of action. See Cort v. Ash, 422 U. S., at 78.
  The language and placement of the statute reinforce this conclusion. The PKPA, 28 U. S. C. § 1738A, is an addendum to the full faith and credit statute, 28 U. S. C. § 1738. This fact alone is strong proof that the Act is intended to have the same operative effect as the full faith and credit statute. Similarly instructive is the heading to the PKPA: “Full faith and credit given to child custody determinations.” As for the language of the Act, it is addressed entirely to States and state courts. Unlike statutes that explicitly confer a right on a specified class of persons, the PKPA is a mandate directed to state courts to respect the custody decrees of sister States. See Cannon v. University of Chicago, 441 U. S., at 690, n. 13; Cort v. Ash, supra, at 81-82. We agree with the Court of Appeals that “[i]t seems highly unlikely Congress would follow the pattern of the Full Faith and Credit Clause and section 1738 by structuring section 1738A as a command to state courts to give full faith and credit to the child custody decrees of other states, and yet, without comment, depart from the enforcement practice followed under the Clause and section 1738.” 798 F. 2d, at 1556.
  Finally, the legislative history of the PKPA provides unusually clear indication that Congress did not intend the federal courts to play the enforcement role that petitioner urges. Two passages are particularly revealing. The first of these is a colloquy between Congressmen Conyers and Fish. Congressman Fish had been the sponsor of a competing legislative proposal — ultimately rejected by Congress — that would have extended the district courts’ diversity jurisdiction to encompass actions for enforcement of state custody orders. In the following exchange, Congressman Conyers questioned Congressman Fish about the differences between his proposal and “the Bennett proposal,” which was a precursor to the PKPA.
  “Mr. Conyers: Could I just interject, the difference between the Bennett proposal and yours: You would have, enforcing the full faith and credit provision, the parties removed to a Federal court. Under the Bennett provision, his bill would impose the full faith and credit enforcement on the State court.
  “It seems to me that that is a very important difference. The Federal jurisdiction, could it not, Mr. Fish, result in the Federal court litigating between two State court decrees; whereas, in an alternate method previously suggested, we would be imposing the responsibility of the enforcement upon the State court, and thereby reducing, it seems to me, the amount of litigation.
  “Do you see any possible merit in leaving the enforcement at the State level, rather than introducing the Federal judiciary?
  “Mr. Fish: Well, I really think that it is easier on the parent that has custody of the child to go to the nearest Federal district court....
  “Mr. Conyers: Of course you know that the Federal courts have no experience in these kinds of matters, and they would be moving into this other area. I am just thinking of the fact that they have [many areas of federal concern and] on the average of a 21-month docket, you would now be imposing custody matters which it seems might be handled in the courts that normally handle that. . . Parental Kidnaping: Hearing on H. R. 1290 before the Subcommittee on Crime of the House Committee on the Judiciary, 96th Cong., 2d Sess., 14 (1980).
  This exchange suggests that Congress considered and rejected an approach to the problem that would have resulted in a “Federal court litigating between two State court decrees.” Ibid.
  The second noteworthy entry in the legislative history is a letter from then Assistant Attorney General Patricia Wald to the Chairman of the House Judiciary Committee, which was referred to extensively during the debate on the PKPA. The letter outlined a variety of solutions to the child-snatching problem. It specifically compared proposals that would “grant jurisdiction to the federal courts to enforce state custody decrees” with an approach, such as was proposed in the PKPA, that would “impose on states a federal duty, under enumerated standards derived generally from the UCCJA, to give full faith and credit to the custody decrees of other states.” Addendum to Joint Hearing 103. The letter endorsed the full faith and credit approach that eventually was codified in the PKPA. More importantly, it “strongly oppose[d]. . . the creation of a federal forum for resolving custody disputes.” Id., at 108. Like Congressman Conyers, the Justice Department reasoned that federal enforcement of state custody decrees would increase the workload of the federal courts and entangle the federal judiciary in domestic relations disputes with which they have little experience and which traditionally have been the province of the States. That the views of the Justice Department and Congressman Conyers prevailed, and that Congress explicitly opted for a full faith and credit approach over reliance on enforcement by the federal courts, provide strong evidence against inferring a federal cause of action. Cf. Cort v. Ash, 422 U. S., at 82 (congressional determination not to create a private cause of action is dispositive).
  Petitioner discounts these portions of the legislative history. He argues that the cause of action that he asks us to infer arises only in cases of an actual conflict between two state custody decrees, and thus is substantially narrower than the cause of action proposed by Congressman Fish and rejected by Congress. The Fish bill would have extended federal diversity jurisdiction to permit federal courts to enforce custody orders in the first instance, before a second State had created a conflict by refusing to do so. This cause of action admittedly is farther reaching than that which we reject today. But the considerations that prompted Congress to reject the Fish bill also militate against the more circumscribed role for the federal courts that petitioner proposes. See Rogers v. Platt, 259 U. S. App. D. C. 154, 164, 814 F. 2d 683, 693 (1987). Instructing the federal courts to play Solomon where two state courts have issued conflicting custody orders would entangle them in traditional state-law questions that they have little expertise to resolve. This is a cost that Congress made clear it did not want the PKPA to carry.
  In sum, the context, language, and history of the PKPA together make out a conclusive case against inferring a cause of action in federal court to determine which of two conflicting state custody decrees is valid. Against this impressive evidence, petitioner relies primarily on the argument that failure to infer a cause of action would render the PKPA nugatory. We note, as a preliminary response, that ultimate review remains available in this Court for truly intractable jurisdictional deadlocks. In addition, the unspoken presumption in petitioner’s argument is that the States are either unable or unwilling to enforce the provisions of the Act. This is a presumption we are not prepared, and more importantly, Congress was not prepared, to indulge. State courts faithfully administer the Full Faith and Credit Clause every day; now that Congress has extended full faith and credit requirements to child custody orders, we can think of no reason why the courts’ administration of federal law in custody disputes will be any less vigilant. Should state courts prove as obstinate as petitioner predicts, Congress may choose to revisit the issue. But any more radical approach to the problem will have to await further legislative action; we “will not engraft a remedy on a statute, no matter how salutary, that Congress did not intend to provide.” California v. Sierra Club, 451 U. S. 287, 297 (1981). The judgment of the Court of Appeals is affirmed.
  It is so ordered.
  Section 1738A reads in relevant part:
  “(a) The appropriate authorities of every State shall enforce according to its terms, and shall not modify except as provided in subsection (f) of this section, any child custody determination made consistently with the provisions of this section by a court of another State.
  “(c) A child custody determination made by a court of a State is consistent with the of this section only if—
  “(1) such court has jurisdiction under the law of such state; and
  “(2) one of the following conditions is met:
  “(A) such State (i) is the home State of the child on the date of the commencement of the proceeding, or (ii) had been the child’s home State within six months before the date of the commencement of the proceeding and the child is absent from such State because of his removal or retention by a contestant or for other reasons, and a contestant continues to live in such State;
  “(B)(i) it appears that no other State would have jurisdiction under subparagraph (A), and (ii) it is in the best interest of the child that a court of such State assume jurisdiction because (I) the child and his parents, or the child and at least one contestant, have a significant connection with such State other than mere physical presence in such State, and (II) there is available in such State substantial evidence concerning the child’s present or future care, protection, training, and personal relationships;
  “(C) the child is physically present in such State and (i) the child has been abandoned, or (ii) it is necessary in an emergency to protect the child because he has been subjected to or threatened with mistreatment or abuse;
  “(D)(i) it appears that no other State would have jurisdiction under subparagraph (A), (B), (C), or (E), or another State has declined to exercise jurisdiction on the ground that the State whose jurisdiction is in issue is the more appropriate forum to determine the custody of the child, and (ii) it is in the best interest of the child that such court assume jurisdiction; or
  “(E) the court has continuing jurisdiction pursuant to subsection (d) of this section.
  “(d) The jurisdiction of a court of a State which has made a child custody determination consistently with the provisions of this section continues as long as the requirement of subsection (c)(1) of this section continues to be met and such State remains the residence of the child or of any contestant.
  “(f) A court of a State may modify a determination of the custody of the same child made by a court of another State, if—
  “(1) it has jurisdiction to make such a child custody determination; and
  “(2) the court of the other State no longer has jurisdiction, or it has declined to exercise such jurisdiction to modify such determination.
  “(g) A court of a State shall not exercise jurisdiction in any proceeding for a custody determination commenced during the pendency of a proceeding in a court of another State where such court of that other State is exercising jurisdiction consistently with the provisions of this section to make a custody determination.”
  The sole exception to this constraint occurs where the first State either has lost jurisdiction or has declined to exercise continuing jurisdiction. See § 1738A(f).
  Mr. Michel’s remarks are echoed in numerous other portions of the legislative history. See, e. g., PKPA Joint Hearing 40-41 (statement of Sen. Durenberger); id., at 12 (statement of Sen. Wallop); PKPA: Addendum to Joint Hearing on S. 105 before the Subcommittee on Criminal Justice of the Committee on the Judiciary and the Subcommittee on Child and Human Development of the Committee on Labor and Human Resources, 96th Cong., 2d Sess., 104-105 (1980) (hereinafter Addendum to Joint Hearing) (letter from Assistant Attorney General Patricia Wald to Rep. Peter Rodino).
  Petitioner argues that determining which of two conflicting custody decrees should be given effect under the PKPA would not require the federal courts to resolve the merits of custody disputes and thus would not offend the longstanding tradition of reserving domestic relations matters to the States. Petitioner contends that the cause of action he champions would require federal courts only to analyze which of two States is given exclusive jurisdiction under a federal statute, a task for which the federal courts are well qualified. We cannot agree with petitioner that making a jurisdictional determination under the PKPA would not involve the federal courts in substantive domestic relations determinations. Under the Act, jurisdiction can turn on the child’s “best interest” or on proof that the child has been abandoned or abused. See §§ 1738A (c)(2)(B), (C), and (D). In fact, it would seem that the jurisdictional disputes that are sufficiently complicated as to have provoked conflicting state-court holdings are the most likely to require resolution of these traditional domestic relations inquiries. See Rogers v. Platt, 259 U. S. App. D. C. 154, 162, 814 F. 2d 683, 691 (1987). Cf. Cort v. Ash, 422 U. S. 66, 84 (1975) (possibility that implied federal cause of action may in certain instances turn on state-law issues counsels against inferring such an action.)
  Moreover, petitioner’s argument serves to underscore the extraordinary nature of the cause of action he urges us to infer. Petitioner essentially asks that federal district courts exercise appellate review of state-court judgments. This is an unusual cause of action for Congress to grant, either expressly or by implication. Petitioner’s proposal is all the more remarkable in the present case, in which he seeks to have a Federal District Court in California enjoin enforcement of a Louisiana state-court judgment before the intermediate and highest appellate courts of Louisiana even have had an opportunity to review that judgment.
choices: comity: civil rights comity: criminal procedure comity: First Amendment comity: habeas corpus comity: military comity: obscenity comity: privacy comity: miscellaneous comity primarily removal cases, civil procedure (cf. comity, criminal and First Amendment); deference to foreign judicial tribunals assessment of costs or damages: as part of a court order Federal Rules of Civil Procedure including Supreme Court Rules, application of the Federal Rules of Evidence, Federal Rules of Appellate Procedure in civil litigation, Circuit Court Rules, and state rules and admiralty rules judicial review of administrative agency's or administrative official's actions and procedures mootness (cf. standing to sue: live dispute) venue no merits: writ improvidently granted no merits: dismissed or affirmed for want of a substantial or properly presented federal question, or a nonsuit no merits: dismissed or affirmed for want of jurisdiction (cf. judicial administration: Supreme Court jurisdiction or authority on appeal from federal district courts or courts of appeals) no merits: adequate non-federal grounds for decision no merits: remand to determine basis of state or federal court decision (cf. judicial administration: state law) no merits: miscellaneous standing to sue: adversary parties standing to sue: direct injury standing to sue: legal injury standing to sue: personal injury standing to sue: justiciable question standing to sue: live dispute standing to sue: parens patriae standing standing to sue: statutory standing standing to sue: private or implied cause of action standing to sue: taxpayer's suit standing to sue: miscellaneous judicial administration: jurisdiction or authority of federal district courts or territorial courts judicial administration: jurisdiction or authority of federal courts of appeals judicial administration: Supreme Court jurisdiction or authority on appeal or writ of error, from federal district courts or courts of appeals (cf. 753) judicial administration: Supreme Court jurisdiction or authority on appeal or writ of error, from highest state court judicial administration: jurisdiction or authority of the Court of Claims judicial administration: Supreme Court's original jurisdiction judicial administration: review of non-final order judicial administration: change in state law (cf. no merits: remand to determine basis of state court decision) judicial administration: federal question (cf. no merits: dismissed for want of a substantial or properly presented federal question) judicial administration: ancillary or pendent jurisdiction judicial administration: extraordinary relief (e.g., mandamus, injunction) judicial administration: certification (cf. objection to reason for denial of certiorari or appeal) judicial administration: resolution of circuit conflict, or conflict between or among other courts judicial administration: objection to reason for denial of certiorari or appeal judicial administration: collateral estoppel or res judicata judicial administration: interpleader judicial administration: untimely filing judicial administration: Act of State doctrine judicial administration: miscellaneous Supreme Court's certiorari, writ of error, or appeals jurisdiction miscellaneous judicial power, especially diversity jurisdiction