Eventually there will be White Flight as is already occurring in California. Businesses, the middle class(of all races), successful working class will all flee to other States. Then, Minnesota will become a kind of independent State within a State as California has done. In the future, America will be 'balkanized' as it is called. It will become as it was in its founding. Just a bunch of adjoined independent States living on a single continent.
I can see that happening in the next hundred years. And there doesn't have to be a war. Everybody can simply migrate to the area of the continent that suits their ideals. We can all divide up, declare independence, and that will be that. Texas and California have already seriously discussed this idea. They will be the first to go.
And with this election, the movement is only going to get bigger. I think it might be a good idea myself.