They never had that right.
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.
I thought you knew the USC.....
You say tomahto, I say tomayto!
The Federal government denied the states the right to nullify Federal acts deemed detrimental to them as unconstitutional
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Non-Sequitur
They never had that right.
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Thomas Jefferson
"[T]he several states composing the United States of America are not united on the principle of unlimited submission to their general government; but that, by compact, under the style and title of the Constitution of the United States, and of certain amendments thereto, they constituted a general government for general purposes, delegated to that government certain powers, reserving, each state to itself, the residuary mass of right to their own self-government; and that whensoever the general government assumes undelegated powers, its acts are unauthoritative, void and of no effect."
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Jefferson Davis
I hope none who hear me will confound this expression of mine with the advocacy of the right of a State to remain in the Union, and to disregard its constitutional obligations by the nullification of the law. Such is not my theory. Nullification and secession, so often confounded, are indeed antagonistic principles. Nullification is a remedy which it is sought to apply within the Union, and against the agent of the States. It is only to be justified when the agent has violated his constitutional obligation, and a State, assuming to judge for itself, denies the right of the agent thus to act, and appeals to the other States of the Union for a decision; but when the States themselves, and when the people of the States, have so acted as to convince us that they will not regard our constitutional rights, then, and then for the first time, arises the doctrine of secession in its practical application.
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For - Nonsensical
James Webb: . . . to tar the sacrifices of the Confederate soldier as simple acts of racism, and reduce the battle flag under which he fought to nothing more than the symbol of a racist heritage, is one of the great blasphemies of our modern age.
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James Madison
From this view of the resolution, it would seem inconceivable that it can incur any just disapprobation from those who, laying aside all momentary impressions, and recollecting the genuine source and object of the Federal Constitution, shall candidly and accurately interpret the meaning of the General Assembly. If the deliberate exercise of dangerous powers, palpably withheld by the Constitution, could not justify the parties to it, in interposing even so far as to arrest the progress of the evil, and thereby to preserve the Constitution itself, as well as to provide for the safety of the parties to it, there would be an end to all relief from usurped power, and a direct subversion of the rights specified or recognised under all the state constitutions, as well as a plain denial of the fundamental principle on which our independence itself was declared.