Davis v. Alvord was a United States Supreme Court case that addressed the issue of whether a state court had the authority to issue a writ of habeas corpus to a prisoner who was being held in a federal prison. The case arose when a prisoner, Davis, was held in a federal prison in the state of California. Davis sought a writ of habeas corpus from the state court, claiming that he was being held in violation of the Constitution. The state court granted the writ, and the federal government appealed the decision to the Supreme Court. The Supreme Court held that the state court did not have the authority to issue a writ of habeas corpus to a prisoner held in a federal prison. The Court reasoned that the writ of habeas corpus was a federal remedy, and that the state court did not have the power to interfere with the federal government's authority to imprison individuals. The Court also noted that the writ of habeas corpus was a remedy that could only be used to challenge the legality of a person's detention, and not to challenge the merits of the underlying conviction. In conclusion, the Supreme Court held that the state court did not have the authority to issue a writ of habeas corpus to a prisoner held in a federal prison. The Court reasoned that the writ of habeas corpus was a federal remedy, and that the state court did not have the power to interfere with the federal government's authority to imprison individuals.

In Davis v. Alvord, the United States Supreme Court was tasked with determining whether a state court had jurisdiction to hear a case involving land located in two different states. The majority opinion held that the state court did not have jurisdiction because it lacked authority over one of the states involved and thus could not adjudicate on matters concerning both states. Justice Field dissented from this decision, arguing that although there may be some constitutional issues at play here, they should be left for another day as they were beyond the scope of this particular case. He argued further that since Congress had given consent to such suits being brought before state courts when it passed legislation allowing them to do so, then those courts must have been deemed competent by Congress and therefore should retain their right to hear cases like these regardless of any potential constitutional issues which might arise later on.