I would not call it 'civil', nor do I think there will be a particular political agenda to blame.
What concerns me, is a natural catasrophe that ruins our water, oil, or food supplies. While there is plenty of food available in the USofA, should we run out of oil, transporting it becomes a problem.
We should already be concerned about clean potable water, most of us are not yet.
The shift to renewable energy from oil is not happening quickly enough.
Even mild mannered people will turn ugly and violent when facing water and food shortages. Coupled with the rampant crime, disquiet with government, immigration problems, lack of social resources..............yes, I think there will be a new revolution in America.
What, I do not know, is when it will happen. It may not effect your children or mine. But I can not promise this.