what did the supreme court decision in marbury v madison establish
Marbury v. Madison Marbury v. Madison, 5 U.S. (1 Cranch) 137 (1803), was a U.S. Supreme Court case that established the principle of judicial review in the United States, meaning that American courts have the power to strike down laws, statutes, and some government actions that contravene the U.S. Constitution. Decided in 1803, Marbury remains the single most important decision in American constitutional law.[1] The Court's landmark decision established that the U.S. Constitution is actual "law", not just a statement of political principles and ideals, and helped define the boundary between the constitutionally separate executive and judicial branches of the American form of government.