Final answer:
John C. Calhoun believed that states could nullify federal laws based on the concept that the federal government was created by the states.
Explanation:
John C. Calhoun believed that states could nullify federal laws because he argued that the federal government was a creation of the states, and therefore, states had the right to determine the constitutionality of federal laws. Calhoun's doctrine of nullification asserted that if a state deemed a federal law unconstitutional, it could nullify it within its borders, leading to the Nullification Crisis in the 1830s.
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