What was the most significant result of the ruling in marbury v. madison

The 1803 Supreme Court case of Marbury v. Madison is one of the most significant rulings in American history because it established a precedent of judicial review -- in other words the right of the courts to declare a law unconstitutional. This precedent plays a pivotal role in the U.S. government's system of checks and balances, as it allows the judicial branch to limit the actions of the legislative branch.