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Let's assume for some reason Mexico collapses in the early 40s and, instead of fighting a war to get California and all that, the US simply swoops in and takes them without a fight. Then things go more or less OTL till we get the Civil War.

How would the Civil War play out in this scenario? None of the big players OTL have the experience from the war, and whatever inefficiencies in the Army the war uncovered are still in full swing here. Would the war last longer? Less?
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