The Mohawk was a Supreme Court case that focused on the power of Congress to regulate commerce between states. The case centered around the steamboat, Mohawk, which had been seized by New York authorities for violating state laws regarding pilotage fees and navigation regulations. The owners of the boat argued that these state laws were unconstitutional because they interfered with interstate commerce, which is regulated solely by Congress under Article I Section 8 of the Constitution. In its decision, the court ruled in favor of the boat's owners and held that only Congress has authority over interstate commerce; thus any conflicting state law must be invalidated as it would otherwise interfere with congressional regulation. This ruling established an important precedent in federalism cases concerning Congressional powers versus those reserved to individual states.

In The Mohawk, the Supreme Court was asked to decide whether a vessel that had been seized by the United States during the Civil War could be sold in order to pay off its debts. A majority of justices held that it could not because Congress had passed a law that prohibited such sales. However, Justice Field dissented from this opinion and argued instead for an interpretation of the statute which would allow for such sales. He reasoned that since Congress did not explicitly prohibit these types of sales, they should be allowed under certain circumstances if it is necessary to protect creditors' rights or prevent frauds upon them. Furthermore, he noted that allowing these kinds of transactions would benefit both debtors and creditors alike as it would provide an avenue through which debts can be paid without having to resort to costly litigation or other means of enforcement. In conclusion, Justice Field argued against his colleagues’ decision and advocated for a more lenient interpretation of the statute in question so as to permit such transactions when necessary