Post US civil war map/scenario

An explanation will follow, but I'm wondering if anyone can guess it. I tilted things a little absurdly in the Confederate's favour, I will admit. The map shows the situation in 1866. The POD is in 1857.

Yes, their is a reasonable explanation for New England being separate from the rest of the North;)

ElectoralCollege1860.svg.png
 
Speaking as an ignorant Englishman, how has the Gadsden Purchase been made already? Also I really strongly doubt that an independent California would let the Confederacy have Arizona without some dispute.
 
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