What were the outcomes and impacts of Marbury v. Madison?

Marbury v. Madison was a Supreme Court case in 1803 that helped define the role of the judicial branch of government. John Marshall, the Chief Justice of the Supreme Court, delivered the decision that the role of the court was to determine whether or not decisions made by Congress were in conflict with the Constitution or previously existing laws. This ability is also referred to as judicial review. Marbury v. Madison was a crucial court case because it defined the role of the judicial branch and outlined the future abilities and limitations of the Supreme Court. It decided that the court did not have jurisdiction to issue a writ of mandamus to the executive branch and that judicial review was its primary purpose.