In Merrick's Executor & Another v. Giddings, the Supreme Court of the United States was asked to decide whether a state court had the authority to issue a writ of mandamus to compel a federal court to act on a case. The case arose when the executor of a deceased man's estate, Merrick, filed a petition in a state court to compel the federal court to act on a case involving the estate. The state court issued a writ of mandamus, but the federal court refused to comply. The Supreme Court held that the state court did not have the authority to issue a writ of mandamus to compel a federal court to act on a case. The Court reasoned that the state court lacked the power to issue a writ of mandamus because the federal court was a court of exclusive jurisdiction, and the state court had no authority to interfere with the federal court's proceedings. The Court also noted that the state court's writ of mandamus was an attempt to control the proceedings of the federal court, which was beyond the scope of the state court's authority. The Court concluded that the state court did not have the authority to issue a writ of mandamus to compel a federal court to act on a case, and the writ of mandamus issued by the state court was invalid.

In Merrick's Executor & Another v. Giddings, the Supreme Court was asked to decide whether a state court had jurisdiction over a case involving parties from different states. The majority opinion held that the state court did not have jurisdiction in this matter because it involved citizens of two different states and thus fell under federal law. However, Justice Field dissented from this decision and argued that there was no clear indication in either the Constitution or any other law which would prevent a state court from exercising its power when both parties were citizens of that same state. He further noted that if Congress intended for such cases to be heard by federal courts exclusively then they should have made their intentions clearer through legislation rather than leaving it up to interpretation by judges.