Answer:
The correct answer is: It was the first time an act of Congress was ruled unconstitutional.
Marbury v. Madison is such an important case in U.S. judicial history because it established the principle of judicial review, which is the power of the Supreme Court to review and declare the actions of other branches of government, specifically the legislative and executive branches, unconstitutional. In this case, the Supreme Court ruled that a section of the Judiciary Act of 1789 was unconstitutional, which was the first time an act of Congress was declared unconstitutional. The decision helped to define the role of the Supreme Court in the United States government and established the principle of judicial review, which remains a vital part of the American system of government today.
Step-by-step explanation: