In reply to the post on Federal Government Supremacy Law.
The enumerated powers (also called expressed powers, explicit powers or delegated powers) of the United States Congress are the powers granted to the federal government of the United States by the United States Constitution. Most of these powers are listed in Article I, Section 8.
In summary, Congress may exercise the powers that the Constitution grants it, subject to the individual rights listed in the Bill of Rights. Moreover, the Constitution expresses various other limitations on Congress, such as the one expressed by the Tenth Amendment: "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."