What document is considered the supreme law of the land in the United States?

The Constitution is regarded as the supreme law of the land in the United States because it establishes the framework for the federal government and delineates the relationship between the government and its citizens. It not only outlines the powers and responsibilities of different branches of government but also ensures the protection of individual rights. The supremacy clause, found in Article VI, explicitly states that the Constitution and federal laws made pursuant to it take precedence over state laws, establishing a clear hierarchy of laws within the nation. This foundational role of the Constitution underscores its authority and importance in the American legal and political system, making it the definitive reference point for legal interpretation and government legitimacy.