Final answer:
The principle established in the case of Marbury v. Madison is that the Supreme Court has the right to determine the constitutionality of legislation.
Step-by-step explanation:
The principle established in the case of Marbury v. Madison was that the Supreme Court has the right to determine the constitutionality of legislation.
In this 1803 case, Chief Justice John Marshall agreed that William Marbury had the right to a legal remedy, but also found that the Judiciary Act of 1789, which would have given the Supreme Court the power to grant Marbury relief, was unconstitutional. This decision established the principle of judicial review, which allows the Supreme Court to review and possibly nullify the actions of Congress and the president.