The United States v. Willings and Francis was a case heard by the Supreme Court in 1807. The two defendants, Willings and Francis, were charged with violating the Neutrality Act of 1794 which prohibited citizens from engaging in foreign naval warfare without permission from Congress. The court found that although they had not received prior authorization to engage in such activities, their actions did not constitute an offense under the law since it only applied to those who acted as privateers or agents of belligerent nations during wartime. Furthermore, the court held that even if their actions could be considered illegal under international law, this would still not make them liable for prosecution under domestic laws like the Neutrality Act since these laws are limited to acts committed within U.S territory or waters subject to its jurisdiction. Ultimately, both defendants were acquitted due to lack of evidence proving any violation on their part beyond reasonable doubt

In The United States v. Willings and Francis, the Supreme Court was asked to determine whether a federal court had jurisdiction over an admiralty case involving two vessels that were owned by citizens of different states. Justice Story delivered the dissenting opinion, arguing that Congress did not have authority under the Constitution to grant such jurisdiction to a federal court in this instance. He argued that since both ships involved in the dispute were owned by citizens of different states, it would be unconstitutional for one state's courts to exercise exclusive jurisdiction over them without consent from all parties involved. Furthermore, he noted that there was no provision within Article III of the Constitution granting Congress power to extend admiralty jurisdiction beyond what is specified therein; thus any attempt by Congress do so would be unconstitutional as well. In conclusion, Justice Story concluded that while it may have been desirable for Congress to provide some form of resolution between these two vessels and their owners through its legislative powers, doing so without constitutional authorization would exceed its authority and violate fundamental principles of justice.