So is that supposed to mean the South didn't go to war to maintain the right of states to assert the inferiority of the black man?
It means the North in general didn't give a damn about ending slavery. The North hated the South and the South hated the North...just like today.
Lincoln was anti slavery...but did you ever hear WHY he didn't free all the slaves?
His own words..."I would do it if I were not afraid that half the [Northern] officers would fling down their arms and three more states would rise."
[link]
The North did not go to war over slavery- but the South did.
And in the end- Lincoln realized that freeing the slaves would preserve the Union- which resulted in both the Emancipation Proclamation and the 13th Amendment.