The Erie Doctrine defines how the federal and state courts interact.

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The Erie Doctrine is a legal principle that governs the relationship between federal and state courts in the United States. It was named after the landmark case Erie Railroad Co. v. Tompkins, 304 U.S. 64 (1938), in which the U.S. Supreme Court held that federal courts sitting in diversity must apply state substantive law. The Erie Doctrine has since been expanded to apply to other areas of federal law, such as federal common law and statutory interpretation.

The Erie Doctrine Defines How the Federal and State Courts