Which group is primarily responsible for interpreting the Constitution?

The Supreme Court is the primary body responsible for interpreting the Constitution. As the highest court in the United States, it has the ultimate authority to decide on the constitutionality of laws, executive actions, and other governmental activities. Through the process of judicial review, established in the landmark case Marbury v. Madison (1803), the Court evaluates whether laws and actions violate constitutional principles.

This role is critical in maintaining the rule of law and ensuring that legislative and executive branches do not overstep their constitutional authority. The Supreme Court's interpretations can lead to significant changes in law and policy, impacting a broad range of issues from civil rights to governmental powers, thereby shaping the application of the Constitution throughout the nation over time.