Federal supremacy? See the Constitution and its "supremacy clause." It doesn't mean that the federal government has all the power or can do whatever it likes, but within its sphere its laws can't be repealed or ignored by state governments. If you disagree, you're arguing against the founders.
I acknowledge the bad precedent set by post-Civil War laws. And I acknowledge the bad precedent set by pre-Civil War laws. Nothing is perfect or without problems or beyond corruption or the possibility of corruption.
I want you to really pay attention this time...
If the feds have any extra-Constitutional jurisdiction over the States, or the people within the States, you DO NOT have a Republic. Therefore supremacy clauses notwithstanding, the Constitution is MEANINGLESS.
Misunderstanding the basics is worse than knowing anything with regard to jurisdiction. Jurisdiction is the lynchpin of republicanism, ignoring it to make a point about a 100 year old war is exactly what the libs want you to do. Thanks.