Which significant principle was established in the case Marbury v. Madison?

The case of Marbury v. Madison established the principle of judicial review, which empowers the judiciary to review acts of the legislative and executive branches and to declare those acts unconstitutional if they contravene the Constitution. This foundational decision, issued by the Supreme Court in 1803, affirmed the role of the Supreme Court and the judiciary as a co-equal branch of government with the authority to check the powers of the other branches. By asserting the ability to invalidate laws and actions that are found to violate the Constitution, judicial review became a crucial mechanism for maintaining the balance of power within the government, thereby safeguarding individual rights and liberties against potential governmental overreach.