Subject Guide
Conflicts of Law
Conflicts of Law is the area of law that governs which jurisdiction's substantive law applies, which court may hear a case, and when one court must recognize and enforce another court's judgment. It supplies the rules courts use to resolve disputes that touch more than one state or sovereign.
What Conflicts of Law covers
Conflicts of Law (also called private international law or choice of law) covers three core questions that arise whenever a dispute crosses state or sovereign lines: which forum may adjudicate, which jurisdiction's law supplies the rule of decision, and whether a judgment rendered elsewhere must be honored. On the bar exam and in upper-level coursework, it is tested through the major choice-of-law methodologies (the traditional vested-rights approach of the First Restatement, the most-significant-relationship test of the Second Restatement, and interest analysis), the constitutional limits on personal and subject-matter jurisdiction, the Full Faith and Credit Clause, and the Erie doctrine governing federal courts sitting in diversity. Mastering it matters because the choice of applicable law often decides the outcome, and conflicts issues are layered onto fact patterns from torts, contracts, family law, and civil procedure rather than tested in isolation.
Key topics
- Choice of Law
- Courts pick the governing substantive law using a recognized methodology, most commonly the Second Restatement's most-significant-relationship test, the First Restatement's territorial vested-rights rules, or governmental interest analysis, subject to constitutional limits and forum public policy.
- Jurisdiction & Judgments
- A court must have constitutionally sufficient personal jurisdiction (minimum contacts under International Shoe) and subject-matter jurisdiction, and a valid final judgment is entitled to recognition and preclusive effect under res judicata and the Full Faith and Credit Clause.
- Federal-State Conflicts
- Under the Erie doctrine a federal court sitting in diversity applies state substantive law and federal procedural law, while the Supremacy Clause makes valid federal law preempt conflicting state law.
Practice Conflicts of Law with LawCoach
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Frequently asked questions
- What is conflicts of law?
- Conflicts of law is the body of rules that decides which jurisdiction's substantive law governs a multistate or multinational dispute, which court may hear it, and whether another court's judgment must be recognized. It does not supply the underlying rule of decision itself; it tells a court whose law to apply. Because the choice of law frequently determines the outcome, conflicts analysis is a threshold step in many cross-border cases.
- What are the main choice-of-law approaches tested on the bar exam?
- The three main approaches are the First Restatement's traditional vested-rights or territorial method, the Second Restatement's most-significant-relationship test, and governmental interest analysis. The First Restatement looks to where a right vested, such as the place of the wrong in tort or the place of contracting; the Second Restatement weighs connecting factors and policy considerations to find the state with the most significant relationship; interest analysis identifies which states have a real policy interest in applying their law. Bar questions often ask you to apply a stated approach to the facts rather than choose among them.
- How does the Erie doctrine relate to conflicts of law?
- The Erie doctrine governs which law a federal court applies when it sits in diversity jurisdiction: it must apply state substantive law and federal procedural law. When deciding which state's substantive law to use, the federal court applies the choice-of-law rules of the state in which it sits, under Klaxon. This connects conflicts of law directly to federal civil procedure, since the same case can raise both an Erie question and a choice-of-law question.
- When must a court enforce a judgment from another state?
- Under the Full Faith and Credit Clause, a state must recognize and enforce a final, valid judgment rendered by a court of another state that had proper jurisdiction over the parties and subject matter. The enforcing court generally may not relitigate the merits, even if it disagrees with the result or would have applied different law. Recognition can be denied where the rendering court lacked jurisdiction, the judgment was procured by fraud, or it is not final, and judgments from foreign nations are handled under comity rather than full faith and credit.
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