Final answer:
Chief Justice Marshall decided in the case of Marbury v. Madison that Marbury had the right to his commission as a justice of the peace, but the Judiciary Act of 1789 was unconstitutional.
Step-by-step explanation:
After speaking with Marbury, Chief Justice Marshall made the decision in the case of Marbury v. Madison in 1803. Marshall ruled that Marbury had the right to his commission as a justice of the peace, but also found that the part of the Judiciary Act of 1789 that would have given the Supreme Court the power to grant Marbury a remedy was unconstitutional.
Chief Justice Marshall decided in the case of Marbury v. Madison that Marbury had the right to his commission as a justice of the peace, but the Judiciary Act of 1789 was unconstitutional. This decision established the principle of judicial review, strengthening the court's power to review and possibly nullify the actions of Congress and the president.