Why John Marshall was instrumental in establishing the principle that the Supreme Court has the authority to declare laws and actions unconstitutional. This authority is called?

John Marshall was instrumental in establishing the principle of judicial review through the landmark case Marbury v. Madison in 1803. In this case, he asserted that it is the duty of the judiciary to interpret the law and to ensure that no law or action contradicts the Constitution. This authority, known as judicial review, solidified the Supreme Court's role as a check on legislative and executive power, reinforcing the principle of constitutional supremacy in the American legal system.