Under the “all needful rules and regulations” clause of the Constitution, the federal statutes following this is constitutional for “All persons born or naturalized in the United States and subject to the jurisdiction thereof” no matter where they reside!
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Money that is not “gold and silver coin” is prohibited in Iowa pursuant to Article I, Section 10 in conjunction with the Tenth Amendment to the Constitution. The state/country named Iowa is not in the United States as decreed in Amendment X.