National Mutual Insurance Company v. Tidewater Transfer Company, 337 U.S. 582 (1949), was a United States Supreme Court case that upheld the constitutionality of 28 U.S.C. ç1332(e). ç1332(e) treats citizens of United States territories as citizens of a state for the purpose of establishing diversity jurisdiction.
This case superseded Hepburn v. Ellzey (1805).