Cite as: 513 U. S. 527 (1995)
Opinion of the Court
Finally, on top of these objections going to the city's premises there is added a most powerful one based on the practical consequences of adopting a multifactor test. Although the existing case law tempers the locality test with the added requirements looking to potential harm and traditional activity, it reflects customary practice in seeing jurisdiction as the norm when the tort originates with a vessel in navigable waters, and in treating departure from the locality principle as the exception. For better or worse, the case law has thus carved out the approximate shape of admiralty jurisdiction in a way that admiralty lawyers understand reasonably well. As against this approach, so familiar and relatively easy, the proposed four- or seven-factor test would be hard to apply, jettisoning relative predictability for the open-ended rough-and-tumble of factors, inviting complex argument in a trial court and a virtually inevitable appeal.
Consider, for example, just one of the factors under the city's test, requiring a district court at the beginning of every purported admiralty case to determine the source (state or federal) of the applicable substantive law. The difficulty of doing that was an important reason why this Court in Romero, supra, was unable to hold that maritime claims fell within the scope of the federal-question-jurisdiction statute, 28 U. S. C. § 1331. 358 U. S., at 375-376 ("[S]ound judicial policy does not encourage a situation which necessitates constant adjudication of the boundaries of state and federal competence"). That concern applies just as strongly to
ton) ("maritime causes . . . so commonly affect the rights of foreigners"); 1 M. Farrand, Records of the Federal Convention of 1787, p. 124 (1911); 2 id., at 46; see generally D. Robertson, Admiralty and Federalism 95-103 (1970). After all, if uniformity of substantive law had been Congress's only concern, it could have left admiralty jurisdiction in the state courts subject to an appeal to a national tribunal (as it did with federal-question jurisdiction until 1875, and as the Articles of Confederation had done with cases of prize and capture).
547
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