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In Marbury v. Madison, the Supreme Court declared an act of Congress unconstitutional for the first time, forming the basis of judicial review in the United States.

Marbury v. Madison

1803 landmark U.S. Supreme Court case

Marbury v. Madison, 5 U.S. 137 (1803), was a landmark decision of the U.S. Supreme Court that established the principle of judicial review, meaning that American courts have the power to strike down laws and statutes they find to violate the Constitution of the United States.…
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Supreme Court of the United States

Highest court of jurisdiction in the US

The Supreme Court of the United States (SCOTUS) is the highest court in the federal judiciary of the United States. It has ultimate appellate jurisdiction over all U.S. federal court cases, and over state court cases that turn on questions of U.S. constitutional or federal law.…
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Act of Congress

Law enacted by the United States Congress

An act of Congress is a statute enacted by the United States Congress. Acts may apply only to individual entities, or to the general public. For a bill to become an act, the text must pass through both houses with a majority, then be either signed into law by the president of…
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Judicial review in the United States

Power of courts to review laws

In the United States, judicial review is the legal power of a court to determine if a statute, treaty, or administrative regulation contradicts or violates the provisions of existing law, a state constitution, or ultimately the United States Constitution. While the U.S.…
Source: Wikipedia (CC BY-SA)