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Congressional hearings determined that the use of mechanical power hammers is very dangerous to the persons using them and to persons in the vicinity of the persons using them. As a result, Congress enacted a statute prohibiting the use of mechanical power hammers on all construction projects in the United States. Subsequently, a study conducted by a private research firm concluded that nails driven by mechanical power hammers have longer-lasting joining power than hand-driven nails. After learning about this study, a city council enacted an amendment to its building safety code requiring the use of mechanical power hammers in the construction of all buildings intended for human habitation.
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A is incorrect. The timing of enactment does not matter in a Supremacy Clause analysis.
C is incorrect. The Supremacy Clause does not require that a federal law expressly state that it supersedes inconsistent state or local laws.
D is incorrect. The city council cannot ignore the Supremacy Clause because it disagrees with the reasoning behind the federal statute due to new information.