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Actually it is the abuse of power at the federal level which makes secession so attractive.
As there is nothing in the constitution to BAR secession, it is constitutionally legal despite what the federal government would like to claim; despite the attempt by the Supreme court to modify the Constitution by their ruling in White vs Texas.
The Supremacy clause makes secession illegal. A state is prohibited from making laws that conflict with federal law; it would be impossible to secede without doing so.
Actually, the Supremacy clause itself acknowledges the very basis for nullification and, by extension, secession. Since you brought it up -- but lack the guts to ask why my answer is correct -- I'll just go ahead and tell you. No, I'll just give you a tiny little HINT, instead.
The Supremacy Clause reads as follows:This Constitution, and the Laws of the United States which shall be made in Pursuance thereof; and all Treaties made, or which shall be made, under the Authority of the United States, shall be the supreme Law of the Land; and the Judges in every State shall be bound thereby, any Thing in the Constitution or Laws of any State to the contrary notwithstanding.
10 to 1 that little tiny hint sails clear over your head at mach speeds, carbuncle.
Your argument assumes that states have the legal authority to determine what is and is not constitutional. They don't.