What does State rights and nullification mean ?

Nullification, in United States constitutional history, is a legal theory that a state has the right to nullify, or invalidate, any federal law which that state has deemed unconstitutional with respect to the United States Constitution (as opposed to the state's own constitution).

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the best answer is b.

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an aneroid barometer is different from a mercury barometer in that it provides readings that increase as air pressure increases.

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