What is the highest source of law in the United States?

The Constitution is considered the highest source of law in the United States because it establishes the fundamental legal framework for the country. It not only outlines the structure of government but also provides the foundational principles that govern all other laws. This includes setting the boundaries of governmental authority, defining the rights of citizens, and establishing the process for making and implementing laws.

Any law, whether it is a statute enacted by a legislature, a regulation created by an administrative agency, or a decision made by a court, must comply with the Constitution. If a law is found to be in conflict with the Constitution, it can be declared invalid. This principle of judicial review, established in landmark cases such as Marbury v. Madison, underscores the authority of the Constitution as the ultimate legal standard in the United States.

Therefore, when considering sources of law, the Constitution holds the highest position and serves as the foundation upon which all other laws are built.