Nullification is the belief that a state had the right to nullify federal laws, secede from the union, and decide whether to allow slavery in the state.
Nullification is a legal theory in United States constitutional history that states have the right to nullify, or invalidate, any federal laws that they deem unconstitutional with regard to the United States Constitution (rather than the state's own constitution). Nullification is the constitutional theory that authorities can invalidate unconstitutional federal laws or judicial decisions, and it has been a source of contention since its inception in early American history.
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