Soft secession?

[Deesse23]

Role of capitalism:
We may witness the unfolding of historical proof that capitalist economies, based on a minimum of regulation, on a maximum of "freedom" (and thus influence by the rich and powerful) actually have less of a halftime (= less stable) than pluralist nations with a social security, because in the long run, people of the latter are more likely to identify with their country and oppose to what has happened in the US before it can happen. The future will tell.

*even if you include the successor states!

Related to this is the problem of income disparity. We may say that the instability of a society or nation is in direct proportion to the concentration of wealth.

Yes, and the american flavour (excessive individualism plus lack of public service and social security) accelerated the generation of disparity. I would not be surprised if demographic data can confirm this.