It's going to be interesting to see how the debt and entitlement crisis will play out over the next few years, months or days.
My guess is that the United States will collapse as a unified country if there are deep divisions between the socialists (California, New York, etc.) and the free / capitalistic states (Texas, Montana, Florida, etc.).
Capital (human and financial would flood out of the socialist states - at an even greater rate than today - into the Free Republic States). I fear that California would, most likely, become a very violent / mob and mexican gang run wasteland or be under persistent martial law). Sinaloa-like gang wars over turf / drugs / food / water are very possible. I live through the Rodney King riots where the LAPD was AWOL for days & we were left to live in total fear. I can't imagine what will happen if the government can no longer pay welfare / EBT / CalFresh to all the gang banger scum in LA, etc.
This will not be like the Great Depression - this will be a fundamental shift in the unity of the nation.