The United States v. Palmer et al. was a Supreme Court case in which the defendants were charged with piracy and murder on the high seas, as well as other offenses against the laws of nations. The court found that although there had been no formal declaration of war between France and America at the time of their alleged crimes, they could still be tried for piracy because it is an offense against all mankind regardless of any particular nation's state or condition. Furthermore, since Congress had passed several statutes criminalizing acts such as those committed by Palmer et al., these statutes gave jurisdiction to American courts over them even though they had not taken place within U.S territory or waters but rather beyond its boundaries in international waters. In conclusion, despite no formal declaration of war existing between France and America at the time, this did not prevent American courts from having jurisdiction over cases involving pirates who commit offenses against all mankind regardless of any particular nation's state or condition when Congress has enacted legislation making such actions illegal under U.S law

In The United States v. Palmer et al., the Supreme Court was tasked with determining whether a federal statute prohibiting privateering was constitutional. Justice Story, in his dissenting opinion, argued that Congress had exceeded its authority under the Constitution by passing such a law. He reasoned that while Congress has broad powers to regulate commerce and navigation between states and foreign nations, it does not have the power to prohibit privateering outright as this would be an exercise of legislative power reserved for individual states under their police powers. Furthermore, he noted that if Congress were allowed to pass such laws without limitation then it could effectively render state sovereignty meaningless by usurping all of its powers over domestic affairs within each state's borders. In conclusion, Justice Story believed that any attempt on behalf of Congress to interfere with or limit privateering should be declared unconstitutional as it is beyond their enumerated powers granted by the Constitution.