The Tenth Amendment has long been ignored, but has never been invalidated. The United States adopted a "Federal" form for government that is based upon shared powers. The STATE was designed to balance and define authorities among different jurisdictions and sovereign entities. The central government was bound to the restrictions of a constitution. The most significant of the "Bill of Rights" amendments is the clear acknowledgment of the basic authority of States' Rights: "The powers not delegated to the United States by the Constitution, nor prohibited by it to the States, are reserved to the States respectively, or to the people."
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