AHC: Earlier American Civil War leading to the South conquering the whole US

State's rights.

Yes, but what exactly are they planning? Witness the major Southern moves in OTL, all of them were based around the South defending already established rights and power. In this period the South was dominant. They didn't need a coup to achieve their ends.
 
You would need a POD going back to the early days of the United States that allows slavery to spread to the Midwest, and flips the political atmosphere so that the agrarian slaveholders are more amenable to a strong central government. With these factors in play, one could imagine some sort of "reverse civil war" where the Free states (Pennsylvania on North, mabye including Michigan and Wisconsin), are increasingly radicalized by the increasing slaveholder power as plantations march further west, pass more intrusive fugitive slave laws, favor Southern infrastructure and free trade, and drag the North into unpopular wars against Mexico, and perhaps even Spain or Britain, to expand slavery. Eventually the Southern Democrats could elect a President that openly advocates making slavery legal throughout the entire nation, which scares the nascent northern industrial working class into fear that they'll be replaced with slaves (or just have to live alongside black people) and causes them to secede.

Even then it'd be a harder war for the Southern Union than OTL was for the North; there's still a ton of industry up there, the terrain is quite unfavorable, and Britain and France may be more willing to support a rebellion against slavery than for it. With enough luck however the South could win such a war and "conquer" the "North," which absent the Midwest never eclipsed the south to the degree of OTL.

It'd also be a rather dystopic US to say the least.
 
A thread almost exactly like this (at least in the question being asked) was just made two days ago.
Was there widespread "CSA gonna conquer the whole US" sentiment during American Civil War?
This isn't "exactly like this". The other thread is about feelings and speculation of the people living at that time. This thread is an AHC.
Sorry, just missed the AHC part of it. I guess that's what I get for posting too quickly. Nevertheless, that thread could be helpful in this discussion.

Yes, as the OP of that other thread, I think it is not directly related but some of the replies there, which are mostly off-topic regarding the question asked, could be helpful for this thread.
 
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