In Whitney v. Cook, the United States Supreme Court addressed the issue of whether a state court could enjoin a federal court from hearing a case. The case arose when the plaintiff, Whitney, sought to enjoin the defendant, Cook, from proceeding with a suit in a federal court. The state court granted the injunction, and the defendant appealed to the Supreme Court. The Supreme Court held that the state court did not have the authority to enjoin the federal court from hearing the case. The Court reasoned that the state court lacked jurisdiction over the federal court, and that the federal court had exclusive jurisdiction over the case. The Court further held that the state court's injunction was an unconstitutional interference with the federal court's jurisdiction. The Court's decision was significant because it established the principle that state courts cannot interfere with the jurisdiction of federal courts. This decision has been cited in numerous subsequent cases, and it remains an important precedent in the area of federal court jurisdiction.

In Whitney v. Cook, the Supreme Court was asked to decide whether a state court had jurisdiction over an action brought by a non-resident against another non-resident in which the property at issue was located within that state's borders. The majority of justices held that such jurisdiction did exist and affirmed the decision of the lower court. Justice Field, however, dissented from this opinion on two grounds: firstly, he argued that it violated due process for a state to exercise personal jurisdiction over individuals who were not present or domiciled within its boundaries; secondly, he maintained that Congress had exclusive authority under Article III of the Constitution to regulate matters concerning diversity jurisdiction between citizens of different states. He concluded his dissent by noting that if Congress intended for states to have such power then they should pass legislation explicitly granting them this authority rather than relying upon judicial interpretation alone.