Would Erie Railroad Co. v. Tompkins Be Decided the Same Way Today?

The Supreme Court overruled Swift v. Tyson (1842) and held that there is no federal general common law. Justice Brandeis's opinion concluded that federal courts exercising diversity jurisdiction must apply the substantive law of the state in which they sit, including state common law as declared by state courts. The decision was grounded in both constitutional concerns—that the Rules of Decision Act required application of state law—and practical concerns about forum shopping and the inequitable administration of law under the Swift regime.

Erie is one of the most consequential decisions in American civil procedure, fundamentally restructuring the relationship between federal and state courts. The Erie doctrine, as developed through subsequent decisions like Guaranty Trust Co. v. York (1945), Byrd v. Blue Ridge Rural Electric Cooperative (1958), and Hanna v. Plumer (1965), has become a sophisticated framework for determining when federal courts must follow state law and when federal procedures may apply instead.

The practical importance of Erie remains significant in modern practice. Federal courts regularly confront Erie questions in diversity cases, particularly in complex litigation, multidistrict litigation, and class actions where the choice between state and federal law can determine outcomes. The Supreme Court continues to refine the Erie doctrine, most recently in Shady Grove Orthopedic Associates v. Allstate Insurance (2010), which addressed the interaction between federal rules and state substantive policies.

The theoretical foundations of Erie have also been enriched by modern scholarship. The decision's concern with forum shopping and the equitable administration of justice resonates with contemporary debates about litigation strategy, venue selection, and the growth of nationwide litigation in federal courts. While the specific problem Erie addressed—the application of different substantive law depending on whether a case was filed in state or federal court—has been largely resolved, analogous issues continue to arise in new contexts.

Erie would almost certainly be decided the same way today. The decision has become so foundational to the structure of American federalism and civil procedure that overruling it is virtually inconceivable. The Erie doctrine is taught in every law school, applied daily in federal courts, and accepted across all interpretive methodologies as a correct statement of the relationship between federal and state law.

The constitutional basis for Erie—that the federal government lacks the power to create general common law rules that displace state substantive law in diversity cases—is consistent with the modern Court's emphasis on federalism and the limited nature of federal power. Originalist justices, in particular, would likely find Erie's reasoning congenial, as the decision respects the constitutional allocation of power between federal and state governments and limits federal judicial lawmaking.

The practical concerns that motivated Erie remain relevant today. Without the Erie doctrine, federal courts sitting in diversity would apply their own substantive rules, creating incentives for forum shopping and undermining the uniformity of law within each state. These problems were well-documented under the Swift regime and would be even more acute in the modern litigation environment, where sophisticated parties routinely make strategic choices about forum selection.

The Erie doctrine has also proven workable and adaptable, despite its well-known complexities. The twin aims test, the outcome-determinative test, and the Hanna v. Plumer framework for Federal Rules of Civil Procedure provide courts with manageable tools for resolving Erie questions, even if the application of these tools sometimes produces uncertainty. The doctrine's longevity and continuous refinement over nearly nine decades testify to its fundamental soundness.

The scholarly debate about Erie has focused less on whether the decision was correct than on its proper scope and application. Henry Hart and Herbert Wechsler's famous exchange about the Erie doctrine laid the foundation for modern analysis, with Hart emphasizing the importance of distinguishing substance from procedure and Wechsler focusing on the allocation of lawmaking authority between federal and state governments.

More recent scholarship has explored Erie's implications for modern litigation practices. Kevin Clermont has argued that the Erie doctrine needs updating to address new forms of complex litigation, including multidistrict litigation and nationwide class actions, where the choice between state and federal law has enormous practical consequences. Adam Steinman has proposed a unified framework for Erie analysis that would reconcile the various tests developed in York, Byrd, and Hanna. The ongoing refinement of Erie scholarship reflects the doctrine's enduring importance and its continuing capacity to generate difficult questions at the intersection of federalism, procedure, and substance.

• Shady Grove Orthopedic Associates v. Allstate Insurance (2010)
• Gasperini v. Center for Humanities (1996)
• Semtek International v. Lockheed Martin (2001)
• Hanna v. Plumer (1965)
• Guaranty Trust Co. v. York (1945)