In the case of Rush v. Parker, the Supreme Court was asked to decide whether a state court had jurisdiction over an action brought by a citizen of another state against someone from that same other state. The plaintiff in this case, Rush, was a resident of Pennsylvania and sued Parker who resided in New Jersey for breach of contract. The defendant argued that since both parties were citizens from different states, only federal courts could have jurisdiction over such cases as per Article III Section 2 Clause 1 of the US Constitution. However, Chief Justice John Marshall disagreed with this argument and held that while it is true that federal courts can hear disputes between two citizens from different states if they so choose; however there is nothing preventing those same disputes being heard by State Courts instead as long as all parties are given due process under law. Thus he ruled in favor of Rush and allowed his suit to be heard before a State Court rather than Federal one

In Rush v. Parker, the Supreme Court was asked to decide whether a state court had jurisdiction over a case involving an officer of the United States Navy and his wife. Chief Justice John Marshall wrote for the minority opinion in this case, arguing that federal courts should have exclusive jurisdiction over cases involving officers of the United States military. He argued that since these officers are appointed by Congress and serve under its authority, they should be subject only to federal law and not state laws or courts. Furthermore, he argued that allowing states to exercise jurisdiction would create confusion as different states could potentially reach conflicting decisions on similar matters concerning members of the armed forces. Ultimately, however, Marshall's dissenting opinion did not carry enough weight with other justices who voted against him in favor of upholding state court jurisdiction in this particular instance due to specific facts related to residency requirements at issue in this case.