What court case established the principle of Judicial Review?

The principle of Judicial Review was established by the case of Marbury v. Madison in 1803. This landmark decision, delivered by Chief Justice John Marshall, confirmed the Supreme Court's authority to review acts of Congress and determine their constitutionality. In this case, the Court held that it had the power to nullify laws that were found to be in conflict with the Constitution, thereby reinforcing the system of checks and balances that is fundamental to the U.S. government. This established the judiciary as a co-equal branch of government with the authority to oversee the actions of the other branches, ensuring that all branches adhere to constitutional principles. This concept has since become a cornerstone of American constitutional law.