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Subject-matter jurisdiction, also called jurisdiction ratione materiae, [1] is a legal doctrine regarding the ability of a court to lawfully hear and adjudicate a case. Subject-matter relates to the nature of a case; whether it is criminal, civil, whether it is a state issue or a federal issue, and other substantive features of the case.
In United States law, federal question jurisdiction is a type of subject-matter jurisdiction that gives United States federal courts the power to hear civil cases where the plaintiff alleges a violation of the United States Constitution, federal law, or a treaty to which the United States is a party.
Diversity jurisdiction is currently codified at 28 U.S.C. § 1332. In 1969, the American Law Institute explained in a 587-page analysis of the subject that diversity is the "most controversial" type of federal jurisdiction, because it "lays bare fundamental issues regarding the nature and operation of our federal union." [2]
Article III, Section 2, Clause 1 of the Constitution states: The judicial Power shall extend to all Cases, in Law and Equity, arising under this Constitution, the Laws of the United States, and Treaties made, or which shall be made, under their Authority;—to all Cases affecting Ambassadors, other public ministers and Consuls;—to all Cases of admiralty and maritime Jurisdiction;—to ...
In order for a district court to entertain a lawsuit, Congress must first grant the court subject matter jurisdiction over the type of dispute in question. The district courts exercise original jurisdiction over—that is, they are empowered to conduct trials in—the following types of cases:
The Federal Circuit is unique among the courts of appeals in that its jurisdiction is based wholly upon subject matter, not geographic location. The Federal Circuit is an appellate court with jurisdiction generally given in 28 U.S.C. § 1295.
A court whose subject matter jurisdiction is limited to certain types of controversies (for example, suits in admiralty or suits where the monetary amount sought is less than a specified sum) is sometimes referred to as a court of special jurisdiction or court of limited jurisdiction.
An independent basis for jurisdiction—the act authorizes writs in aid of jurisdiction, but does not in itself create any federal subject-matter jurisdiction. Necessary or appropriate in aid of jurisdiction—the writ must be necessary or appropriate to the particular case.