ANSWERS: 2
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No. National laws are applied the same way to all states, whether or not they call themselves a "commonwealth."
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The U.S. Constitution supersedes any state law, regardless of what the state calls it self. Those names are meaningless from any legal perspective. The supremacy of the Constitution and the Federal jurisdictions it describes, and indeed any law passed by Congress (assuming it is not un-constitutional), is an integral part of the Constitution. It was clarified in a major Supreme Court case Gibbons v. Ogden
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