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The U.S. Supreme Court serves as the final arbiter of the meanings of the U.S. Constitution due to its role in interpreting constitutional law. This authority is derived from the principle of judicial review, established in the landmark case Marbury v. Madison in 1803, which grants the Supreme Court the power to invalidate laws and executive actions that it finds to contradict the Constitution.

Through its interpretations, the Supreme Court sets legal precedents that guide lower courts and government officials in understanding and applying constitutional principles. The Court's decisions can resonate across the country, impacting various areas of law and public policy. As such, it plays a crucial role in maintaining the rule of law and ensuring that the Constitution remains the supreme law of the land.

While other entities like states, the President, and the House of Representatives have significant roles in governance, they do not possess the same level of authority in constitutional interpretation as the Supreme Court. Therefore, the U.S. Supreme Court's position as the ultimate interpreter of the Constitution underscores its vital role within the framework of the American legal system.