Amendment X
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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The Tenth Amendment expresses the principle that undergirds the entire plan of the original Constitution: the national government possesses only those powers delegated to it. The Framers of the Tenth Amendment had two purposes in mind when they drafted it. The first was a necessary rule of construction. The second was to reaffirm the nature of the federal system.