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A federal mandate
Federal Securities Act
Local, State or Federal laws
Federal law prohibits federal funds including Medicaid funds, from being used to pay for an elective abortion
Preemption
a mandate
By federal law, yes. Federal law prohibits "Undocumented immigrants."
The first amendment.
None. FEDERAL law prohibits it.
The Third Amendment prohibits the quartering of soldiers whether it be peacetime or wartime.
Yes, there is. Lots of them, in fact.
I believe you're looking for antitrust laws