Which of the following was the most significant decision of John Marshall’s Supreme Court?

right of the Supreme Court to void acts of Congress

legal implementation of segregationist policies across the nation

expansion of the role of the president to make economic policies

adoption of free trade agreements between Central and North America

John Marshall was a lawyer, judge, politician, diplomat, legislator, statesman, jurist and American military, Marshall was originally from the Commonwealth of Virginia and leader of the federalist party. He was also Secretary of State with President John Adams, performing this work until his appointment on February 4, 1801 in the Supreme Court of the United States. His work and his figure was very prominent, for occupying the position President of the Supreme Court of the United States until his death, in which there was a great transformation in the legal and judicial system, and transcendent judicial processes such as: Marbury v . Madison in 1803, which happens to be the most famous sentence in history, according to which the function of judges is to say what is law and in which it is said -textually- that "a law contrary to the Constitution is null , and that the courts, in addition to the other powers, are subject to the Constitution ", in addition, the McCulloch v. cases are also found. Maryland in 1819 and Cohens v. Virginia in 1821. Being the Presiding Judge with more time in office (34 years), and the fourth with more time depending on the court.