Slavery was why the north and south were fighting, so it would be slavery
McClellan discovered General Robert E. Lee's battle plan.
Obviously, infiltration and access to battle plans allow for the opponent to figure out what their opponent's plans are, thus giving McClellan the victory at Antietam.
Hope this helps!
I'm notoriously concerned of your intentions of this website- what do you want with this information?
Pretty sure it's the Kitchen Cabinet.
Both were huge into the business industry, Carnegie was a leader in the steel industry as well.
