Explain what is judicial review and how is judicial review used?

Judicial review is a review by the US Supreme Court of the constitutional validity of a legislative act.

how is judicial review used:

Judicial review, power of the courts of a country to examine the actions of the legislative, executive, and administrative arms of the government and to determine whether such actions are consistent with the constitution. Actions judged inconsistent are declared unconstitutional and, therefore, null and void.

Explanation:

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