Marbury v. Madison is considered a landmark case mostly because the court’s ruling

In Marbury v. Madison (1803), the Supreme Court ruled that it could declare laws unconstitutional. This power is called judicial review, and it became a key way the Court can check the actions of Congress and the president. The case is considered a landmark mainly because it established this principle, not simply because it involved the court system or a future president.

AI-written and checked against the verified answer.