In Swan v. Arthur, the Supreme Court of the United States was asked to decide whether a contract between two parties was valid and enforceable. The contract in question was between Swan and Arthur, and it stated that Arthur would pay Swan a certain amount of money in exchange for Swan's services. The Supreme Court held that the contract was valid and enforceable. The Court noted that the contract was clear and unambiguous, and that both parties had agreed to its terms. Furthermore, the Court found that the contract was supported by consideration, meaning that both parties had given something of value in exchange for the other's promise. The Court also held that the contract was not voidable due to any lack of capacity on the part of either party. The Court noted that both parties were of sound mind and had the capacity to enter into a contract. Finally, the Court held that the contract was not voidable due to any fraud or misrepresentation. The Court found that there was no evidence that either party had made any false statements or had acted in bad faith. In conclusion, the Supreme Court held that the contract between Swan and Arthur was valid and enforceable.

In Swan v. Arthur, the United States Supreme Court was tasked with determining whether a state court had jurisdiction to hear a case involving an alleged breach of contract between two parties who were citizens of different states. The majority opinion held that the state court did not have jurisdiction and dismissed the case. Justice Field dissented from this decision, arguing that under Article III of the Constitution, Congress has granted federal courts exclusive original jurisdiction over cases where there is diversity in citizenship among litigants. He argued further that since Congress has not specifically excluded such cases from being heard by state courts, it should be assumed they are allowed to do so unless expressly prohibited by law or precedent. Furthermore, he noted that allowing states to hear such cases would help reduce congestion in federal courts while still providing adequate protection for all involved parties due to their respective laws governing contracts and other matters related thereto.