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...
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