Marbury v. madison is significant today because

It established the supreme court as a check against Congress.

Explanation:

Marbury vs Madison is considered as the landmark in the history of the United States and regarded as "the most significant contribution that the US has made to the art of government". This decision was known as one of the historic decisions that have its relevance today also as it allows the Court to check the constitutional laws. It established the power of the Judicial branch with a principle of Judicial review to the Supreme Court. Thus, it foregrounded the decision that the supreme court to keep a check against Congress.

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