The southern region... i think!
They said it was a modern day war because of the thing that were invented during the time. Lincoln love Morse code he use to sit in the message room and read and reply to almost all of the messages. They also had the Minnie ball come along witch made it easier for a good kill to happen then there is the rail way stations they were added well the war was going on but there was more in the north then there was in the South
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Natural monopoly that would be my Best guest