Klaxon Company v. Stentor Electric Manufacturing Company, 313 U.S. 487 (1941), was a United States Supreme Court case in which the Court applied the choice-of-law principles of Erie Railroad v. Tompkins to conflicts between laws of different states for cases sitting in federal court on diversity jurisdiction.

The court held that a federal court sitting in diversity must apply the choice-of-law doctrine of the forum state to choose between the forum state's law and the other state's law (as distinguished from the federal choice-of-law doctrines which had been used before Erie).

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