Federal Question Jurisdiction

Federal question jurisdiction is one of the two main heads of subject-matter jurisdiction for U.S. federal district courts, alongside diversity jurisdiction. It is grounded in Article III, Section 2 of the U.S. Constitution, which extends the federal judicial power to cases "arising under this Constitution, the Laws of the United States, and Treaties made...under their Authority." Congress implemented this grant through the general federal-question statute, 28 U.S.C. § 1331, which gives district courts original jurisdiction over "all civil actions arising under the Constitution, laws, or treaties of the United States."

Although the constitutional "arising under" language has been read broadly (see Osborn v. Bank of the United States, 1824), the statutory version is narrower. Under the well-pleaded complaint rule articulated in Louisville & Nashville Railroad Co. v. Mottley (1908), a federal question must appear on the face of the plaintiff's properly pleaded complaint; an anticipated federal defense or a federal counterclaim does not suffice. The Supreme Court refined the doctrine in Grable & Sons Metal Products v. Darue Engineering (2005), allowing jurisdiction over state-law claims that necessarily raise a substantial, disputed federal issue capable of resolution without disturbing the federal-state balance.

Key features:

• No amount-in-controversy requirement since 1980, when Congress removed the $10,000 threshold from § 1331.
• Concurrent jurisdiction with state courts is the default; federal courts have exclusive jurisdiction only where Congress so provides (e.g., patent, bankruptcy, most antitrust).
• Removal: Defendants may remove a federal-question case from state court to federal court under 28 U.S.C. § 1441.

For IR and Model UN researchers, federal question jurisdiction is the procedural gateway through which U.S. courts adjudicate claims under treaties, the Alien Tort Statute (28 U.S.C. § 1350), the Foreign Sovereign Immunities Act, and federal civil rights statutes—making it central to how international law is enforced domestically in the United States.