In Erie v. Tompkins, where Tompkins was hit by a New York train in Pennsylvania, the Supreme Court held that federal common law, as first announced in Swift v. Tyson, had to be applied to cases where there was diversity of citizenship, forcing the case into federal court.

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The Supreme Court held in Erie v. Tompkins that federal common law did not apply in diversity cases and that state law must be applied in federal court. This overruled the previous ruling in Swift v. Tyson.

In Erie V Tompkins, Where Tompkins Was Hit by a New York