AHC/PC: An East-West Second ACW?

With a POD anytime after the end of OTL's ACW and the beginning of WWI is there any possibility of an East-West Second ACW?

We'll say at minimum at least three former Mexican territories secede and at maximum everything to the west of Mimal Man...

Is it plausible and if so, how?

Excuse the lack of research, I was looking at a map and the idea just came to me...

Edit: Use of an alternate presidency being the spark allowed, and if needed, encouraged.
 
I don't know one for that time frame your allotting, but there is a TV show that put forward the idea of how a second ACW would start out, and it had an East vs West theme to it.

Said show being Jericho.
 
Looks interesting, thanks...

It's nowhere near what I'm envisioning here, however.

What was the tax system like in the territories of the west in the late nineteenth century?
 
If the South had seceded successfully, I think that revolution and civil war might have been possible in later decades for the North.
 
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