There is No underlying sectionalism,based on totally different societal orders.
The states themselves are not talking about "legally" separating from the Union.
The first war proved that the states are part of a whole. The whole is made up of states but is also independent of them. THE FED.
The federal system is not what the founders envisioned. It is a monstrosity created since 1913 when the federal reserve was founded.
The currency is what's important now.
The Banks Own Everyone. Even Congress and the Courts,to a lesser degree.
A real civil war would be against the Banks.