Oddly enough there are many historians who would disagree with you. My college history Prof was one of them... and he was from somewhere up North, and his ancestors hadn't even arrived in 1865, so it isn't like he had any dog in that fight. He was just concerned with historical accuracy. His History of the Civil War class was awesome, much like his History of Vietnam class.... he began the latter class with "to understand the root causes of the Vietnam War, we must begin in approximately 900 BC, when the ...."
Very thorough fellow who looked deeper than surface issues.
Fiddling While Rome Burns
Carthago Delenda Est
"I used to roll the dice; see the fear in my enemies' eyes... listen as the crowd would sing, 'now the old king is dead, Long Live the King.'.."
There were obviously many individual motives for the individual soldiers, but most of the issues for the Confederacy revolved around slavery.
"It ain't what they call you, it's what you answer to." - W. C. Fields
"Absence of evidence is not evidence of absence." - Dr. Carl Sagan