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Who has the power to declare a federal law unconstitutional in the United States?

  1. President.

  2. Supreme Court.

  3. Congress.

  4. State governors.

The correct answer is: Supreme Court.

The Supreme Court has the power to declare a federal law unconstitutional in the United States. This is because of the principle of judicial review, which allows the Supreme Court to interpret laws and determine if they are in line with the Constitution. Options A, C, and D do not have this power. The President can veto laws, but the Supreme Court can still override that veto if they find the law unconstitutional. Congress can pass laws, but they are subject to judicial review by the Supreme Court. State governors only have power in their respective states and do not have the authority to declare federal laws unconstitutional.