Answer:
The relationship between state and federal regulations in the United States is one of delegation and complement: in principle, the states are the holders of sovereignty and, therefore, possess all the rights and powers that they have not expressly delegated to the Federal Government to through the Constitution. In turn, in the event that the states have delegated prerogatives to the federal government, these may only be exercised by the federal government, and subsidiarily (and always in a complementary manner and respecting federal guidelines) by the states.
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