United States v. Adams was a United States Supreme Court case that dealt with the issue of whether a federal statute that prohibited the sale of liquor on Indian reservations was constitutional. The Court held that the statute was constitutional, and that Congress had the power to regulate commerce on Indian reservations. The case arose when the defendant, Adams, was charged with selling liquor on an Indian reservation in violation of a federal statute. Adams argued that the statute was unconstitutional because it violated the Indian Commerce Clause of the Constitution, which gives Congress the power to regulate commerce with Indian tribes. The Supreme Court disagreed, holding that Congress had the power to regulate commerce on Indian reservations, and that the statute was constitutional. The Court reasoned that Congress had the power to regulate commerce on Indian reservations because it was necessary to protect the health and welfare of the Indians. The Court also noted that the statute was not an infringement on the sovereignty of the Indian tribes, as it only regulated the sale of liquor on the reservations, and did not interfere with the tribes' internal affairs. In conclusion, the Supreme Court held that the federal statute prohibiting the sale of liquor on Indian reservations was constitutional, and that Congress had the power to regulate commerce on Indian reservations. The Court's decision established an important precedent for the regulation of commerce on Indian reservations.

In United States v. Adams, the Supreme Court was asked to decide whether a person who had been convicted of an offense in state court could be tried again for the same crime in federal court. The majority opinion held that such double jeopardy did not violate the Constitution and that it was permissible for a defendant to be tried twice for the same offense if one trial occurred in state court and another occurred in federal court. Justice Field dissented from this ruling, arguing that allowing multiple trials violated both due process and equal protection under law as guaranteed by the Fifth Amendment of the U.S. Constitution. He argued that permitting two separate prosecutions would lead to oppressive practices against defendants since they would have no way of knowing when their prosecution might end or how many times they might be prosecuted on similar charges before being found innocent or guilty beyond a reasonable doubt. Furthermore, he noted that there were other ways available to protect society without resorting to double jeopardy which should instead be used whenever possible so as not to infringe upon constitutional rights granted by our founding fathers