Exclusive federal powers
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Exclusive federal powers are powers within a federal system of government that each constituent political unit (such as a state or province) is absolutely or conditionally prohibited from exercising. That is, either a constituent political unit may never exercise these powers, or may only do so with the consent of the federal government.
- Scardino, Frank. The Complete Idiot's Guide to U.S. Government and Politics, p. 31 (Penguin 2009).