Same could be said for Texas and the Comanche.
But there is a difference - the North was the aggressor. The South simply wanted to assert it's right to secede and to live peaceably.
It did not seek to invade the North (except when forced to in self-defense), or control the North.
The war which led to many unforeseen evils, such as the Indian attacks along the frontier, was caused by Northern intransigence.
I will not deny the bravery and self-sacrifice of Minnesotans. But the war launched by the North was not a Just war, by any standard.