The Constitution
Tenth Amendment
Powers not delegated to the federal government, nor prohibited to the states, are reserved to the states or to the people.
In full
The amendment states the structural premise of federalism rather than adding a new limit. Its practical force appears in the anticommandeering rule: the federal government may regulate individuals directly and may attach conditions to money, but it may not order state legislatures to legislate or state officers to administer a federal program.
Also written as: anticommandeering
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A plain-language explanation for civic education, not legal advice. When in doubt, the official source named above controls.