Erie doctrine
Doctrine in US federal civil procedure / From Wikipedia, the free encyclopedia
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The Erie doctrine is a fundamental legal doctrine of civil procedure in the United States which mandates that a federal court called upon to resolve a dispute not directly implicating a federal question (most commonly when sitting in diversity jurisdiction, but also when applying supplemental jurisdiction to claims factually related to a federal question or in an adversary proceeding in bankruptcy) must apply state substantive law.
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The doctrine follows from the Supreme Court landmark decision in Erie Railroad Co. v. Tompkins (1938). The case overturned Swift v. Tyson, which allowed federal judges sitting in a state to ignore the common law local decisions of state courts in the same state in diversity actions.