Under the leadership of cheif justice john marshall, the united states supreme court issued decisions that

The Marshall Court is one of the, if not the most, important courts of American history. The most famous case of his court was Marbury v. Madison which stated ultimately that the court could review any executive or legislative bills or appointments for constitutionality. This case solidifies the Court's place in the three branches and clears the confusion regarding the Court's place and purpose. Judicial review is the most important job of the Court and has been the major purpose since. He also led the Court in decisions regarding interstate trade, transportation, banking, and federal law trumping state laws.