What is the highest court in the United States?

The Supreme Court is the highest court in the United States, serving as the final arbiter of federal constitutional law. It has the authority to interpret the Constitution and to review decisions made by lower courts, including federal courts and those from state courts that involve significant constitutional or federal issues.

The Supreme Court is composed of nine justices who are nominated by the President and confirmed by the Senate. It can choose which cases to hear, often selecting those that have broader implications for the legal system or public policy, thus shaping American law in profound ways.

In contrast, the District Court is a trial-level court that hears most federal cases, but it is not the highest authority. The Circuit Court, which can refer to the courts of appeals in different contexts, primarily reviews appeals from the District Courts but does not hold the ultimate authority. Similarly, the Court of Appeals primarily handles appeals from the District Courts and state courts of last resort, but it does not have the same level of authority as the Supreme Court. Therefore, while all these courts play important roles within the judicial system, the Supreme Court stands at the top, making it the correct answer.