Why was Marbury v. Madison a landmark Supreme Court case? It established that the Supreme Court could use judicial review to check the powers of the legislative and executive branches.

It said that the Constitution could be interpreted by the legislative branch and the executive branch differently than by the judicial branch.

It made it unconstitutional for an outgoing president to make appointments that the next president might dislike.

It declared that Supreme Court justices, who previously had been appointed for ten-year terms, would serve for life.