It was the first time that the Supreme Court was able to declare an act of Congress unconstitutional.
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Marbury vs Madison was an ingenious decision. Marbury vs Madison was the first case of judicial review that voided the act of congress.
The judicial power to decide whether a law is constitutional.
Marbury v. Madison
It established the power of judicial review.Marbury v Madison solidified the idea of judicial review, and that the Constitution is superior to other laws... thus a law can be declared unconstitutional by the court.
From the case of Marbury v. Madison