Answer:-
In the United States, the branch of government responsible for declaring laws unconstitutional is the judicial branch. This authority is granted to ensure a system of checks and balances among the three branches: legislative, executive, and judicial. When a law is challenged in court, it's the role of the judiciary, including the Supreme Court and lower federal courts, to interpret the law in accordance with the Constitution. If a law is found to violate constitutional principles, the judiciary has the power to declare it unconstitutional, nullifying its legal effect.
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