What is the difference between federal and state law in determining whether a corporation can sue in a federal court in a diversity action?

In diversity cases the federal courts generally apply state law in deciding substantive questions and federal law in deciding procedural ones. See Hanna v. Plumer, 380 U.S. 460, 465, 471, 85 S.Ct. 1136, 14 L.Ed.2d 8 (1965). "[T]he amenability of a foreign corporation to suit in a federal court in a diversity action [, however,] is determined in accordance with the law of the state where the court sits, with 'federal law' entering the

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