Strawbridge v. Curtiss, 7 U.S. (3 Cranch) 267 (1806), was a case in which the Supreme Court of the United States first addressed the question of complete diversity for diversity jurisdiction.

In a 158-word opinion the Court held that for federal diversity jurisdiction, under section 11 of the Judiciary Act of 1789, no party on one side of a suit may be a citizen of the same state as any party on the other side.

[1] Therefore, when there are joint plaintiffs or defendants, jurisdiction must be established as to each party.

That requirement remains acceptable in law as a matter of statutory interpretation, not constitutional command.

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