[DubiousPusher]

Absolutely. The cause of the war was succession. There was no legally defined process for succession and the withdrawal of United States soldiers from the territory of succeeded parties. If there had been, would the North have fought a noble war sacrificing life and treasure to free black people? Absolutely not. For god sake, they barely passed the 13th amendment. Abraham Lincoln himself said that if he could restore the Union without freeing a single black he would.

What is fiction however is that any other issue besides slavery led the South to succeed. Here are the "Declaration of Causes of Succession" made by four of the states.

http://www.ucs.louisiana.edu/~ras2777/amgov/secession.html

These documents were intended as equivalents to the Declaration of Independence made by the U.S. in which Thomas Jefferson outlined a list of grievances the colonists had with the king. The grievances you'll find in these documents almost exclusively revolve around slavery. The one from Texas contains this little gem.

"We hold as undeniable truths that the governments of the various States, and of the confederacy itself, were established exclusively by the white race, for themselves and their posterity; that the African race had no agency in their establishment; that they were rightfully held and regarded as an inferior and dependent race, and in that condition only could their existence in this country be rendered beneficial or tolerable."

Yes, the war was about white people and their problems with each other but that does not mean the Confederacy was not a horrifyingly evil society. They desired to raise a nation founded on the principal of racist slavery. And people rightly object to being subjected to the symbols of that nation.