What is the highest court in the United States?

The Supreme Court is the highest court in the United States, serving as the ultimate arbiter of the law and interpretation of the Constitution. It has the authority to hear appeals on important legal issues, especially those involving constitutional rights, and its decisions set precedents that all lower courts must follow. The Court's composition includes nine Justices who are nominated by the President and confirmed by the Senate, which underscores its significant role in the U.S. judiciary system. This court has the power to overturn decisions made by lower courts and to rule on the constitutionality of laws, thereby shaping American law and society.

In contrast, the District Court serves as the trial courts in the federal system and primarily handles cases at the initial level, while the Court of Appeals reviews decisions made by the District Courts but does not serve as the highest authority. The International Court typically refers to the International Court of Justice, which deals with legal disputes between countries and is not part of the U.S. judicial system. Thus, the prominence and function of the Supreme Court establish its position as the highest court in the United States.