United States v. Moore is a United States Supreme Court case that was decided in 1895. The case involved a dispute between the United States and a man named Moore, who was accused of violating the federal law prohibiting the sale of liquor to Native Americans. Moore argued that the law was unconstitutional because it violated the Fifth Amendment's guarantee of due process. The Supreme Court held that the law was constitutional and that the government had the right to regulate the sale of liquor to Native Americans. The Court reasoned that the law was a valid exercise of the government's power to regulate commerce with Native Americans, and that it did not violate the Fifth Amendment's due process clause. The Court also noted that the law was necessary to protect Native Americans from the dangers of alcohol abuse. In conclusion, the Supreme Court held that the law prohibiting the sale of liquor to Native Americans was constitutional and did not violate the Fifth Amendment's due process clause. The Court reasoned that the law was a valid exercise of the government's power to regulate commerce with Native Americans, and that it was necessary to protect Native Americans from the dangers of alcohol abuse.

In United States v. Moore, the Supreme Court was asked to decide whether a federal court had jurisdiction over a case involving an alleged violation of the Civil Rights Act of 1866. The majority opinion held that it did not have jurisdiction because Congress had not given them authority to hear such cases. Justice Field dissented from this decision and argued that Congress intended for federal courts to have jurisdiction in civil rights cases when they involved citizens of different states or territories, as was the case here. He reasoned that if Congress wanted state courts to handle these matters exclusively, then they would have explicitly stated so in their legislation rather than leaving it up for interpretation by the judiciary branch. Furthermore, he noted that allowing state courts exclusive power over civil rights issues could lead to unequal protection under law since some states may be more lenient on violations than others are. Ultimately, Justice Field believed that federal courts should be allowed to exercise their discretion and determine whether or not they can take on certain civil rights cases based upon its merits instead of having all such matters decided solely at a state level without any input from higher authorities like those found within the judicial branch