Louisville & Nashville Railroad Co. v. Mottley
Facts
The plaintiffs brought suit in federal Circuit Court to enforce a contract for transportation against the railroad. The demurrer raised questions about whether a federal statute of June 29, 1906 made performance of that contract unlawful and, if so, whether the statute violated the Fifth Amendment. There was no diversity of citizenship, so the only possible basis for jurisdiction was that the suit arose under the Constitution or laws of the United States. The plaintiffs' assertion of federal law appeared in response to an anticipated defense based on the federal statute.
Issue
Whether the federal Circuit Court had federal question jurisdiction where the plaintiffs' own cause of action did not itself arise under federal law, but the complaint anticipated a defense under a federal statute and alleged that defense would be invalid under the Constitution.
Rule
A suit arises under the Constitution or laws of the United States only when the plaintiff's own statement of his cause of action shows that it is based on federal law or the Constitution. It is not enough that the plaintiff anticipates a defense to his cause of action and asserts that the defense is invalidated by the Constitution or federal law.
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Assuming there is no diversity jurisdiction, does the federal court have subject matter jurisdiction?