Law Commons^™

Is federal diversity jurisdiction case-specific or claim-specific? Consider a state-law case in federal court between a Texas plaintiff and two defendants—one from California and the other from Texas. The complete-diversity rule taught to every first-year law student makes clear that, when the diversity defect is noted, the court lacks subject-matter jurisdiction over the action as a whole. The court cannot, therefore, proceed with either claim as long as the nondiverse claim remains. But does the court’s subject-matter jurisdiction nevertheless extend to the diverse claim, such that the case can continue if the spoiler is dismissed? This question is both pervasive …

In the American system of dual sovereignty, states have primary authority over matters of state law. In nonpreemptive areas in which state and federal regimes are parallel—such as matters of court procedure, certain statutory law, and even some constitutional law—states have full authority to legislate and interpret state law in ways that diverge from analogous federal law. But, in large measure, they don’t. It is as if federal law exerts a gravitational force that draws states to mimic federal law even when federal law does not require state conformity. This paper is the first to explore the widespread phenomenon of …