History
Judicial Review and the Power of Constitutional Interpretation
Quick fact
The U.S. Supreme Court did not explicitly declare any federal law unconstitutional until Marbury v. Madison (1803), more than a decade after the Constitution was adopted.
Why this is interesting
In a democracy, what happens if the government passes a law that violates the Constitution? Who decides that it's unconstitutional? The surprising answer: not the elected leaders, but unelected judges.
Read the full explanation
Understanding Judicial Review and the Power of Constitutional Interpretation
Judicial review is the power of courts—especially supreme or constitutional courts—to review the acts of the legislative and executive branches and strike them down if they conflict with the Constitution. This power is not explicitly written in the U.S. Constitution; it was established by the Supreme Court in Marbury v. Madison (1803). Chief Justice John Marshall reasoned that because the Constitution is the supreme law, any law that contradicts it must be invalid. Since judges take an oath to uphold the Constitution, they must be able to interpret it and refuse to enforce unconstitutional laws. In practice, judicial review works as a checking mechanism. When a case is brought to court, the judge examines the relevant law and the constitutional text. If they find a conflict, the law is declared void. This doesn't happen often, but the mere possibility influences how lawmakers draft laws, and it protects fundamental rights from temporary majorities.
A deeper explanation
The underlying principle of judicial review is the supremacy of the Constitution over ordinary legislation. Alexander Hamilton wrote in Federalist No. 78 that the judiciary must be the guardian of the Constitution because it is the least dangerous branch, having no power over the sword or the purse. By declaring a law unconstitutional, the court doesn't directly command anyone, but its decision becomes the law of the land. This power is what makes the Constitution the supreme law, not just a set of ideals. Over time, judicial review has evolved through landmark cases: from Marbury v. Madison (federal statutes) to Martin v. Hunter's Lessee (state laws), to the incorporation of the Bill of Rights to the states. The power also raises questions of interpretation: originalists argue judges should stick to the Founding era's intent, while living constitutionalists argue the text must adapt to modern circumstances. Judicial review is sometimes criticized as counter-majoritarian, but it remains a key guarantee that government stays within constitutional bounds, protecting individual rights and ensuring long-term stability.