The Confederate states issue with states rights in 1860 was not about amendments or the laws within the Constitution, theirs was an exact copy- give or take a word. It was with the illegality of the one state invading another by armed forces, federal coercion against the states, the arrest of state governments, the right to self determination and a better union, etc.
In Mississippi's defence- backing the 18th was protecting its right to stay a dry state and not be effected by outside forces. ________________________
David Upton