Okay, Nomad, let's go there. The Civil War happened just over 70 years after the Constitution was ratified, just under 150 years ago. Lincoln was just not that far removed historically from our founding to be allowed a pass for what he did to that document. He basically disregarded it. He trashed the first amendment, habeas corpus, the commerce clause and the enumerated powers clause. The reason for those clauses must surely have still been fresh in the collective minds of Americans when he so ruthlessly quashed them.
I also don't understand where NOT fighting that war would have significantly diminished the black population.