I just can't see it myself.
The modern world is devoid of the kind of pressures that caused past upheavals (famine, poverty, starvation). If the USA had all 7 billion people in the world on its territory it would only be as densely populated as Britain or Holland. These countries are more likely to face future civil war than the USA. If people can move away from danger quietly -they will (white flight).
What I think will happen (with the current power struggle between Russia and the USA) is the high watermark of american failure (Syria). Demographic change in the USA means it can never have a republican or white president again unless it jetisons whole states (Florida, Mississippi, California. Texas). That- or it splits up some other way peacefully, divorces itself into a multitude of insignificant statelets
The modern world is devoid of the kind of pressures that caused past upheavals (famine, poverty, starvation). If the USA had all 7 billion people in the world on its territory it would only be as densely populated as Britain or Holland. These countries are more likely to face future civil war than the USA. If people can move away from danger quietly -they will (white flight).
What I think will happen (with the current power struggle between Russia and the USA) is the high watermark of american failure (Syria). Demographic change in the USA means it can never have a republican or white president again unless it jetisons whole states (Florida, Mississippi, California. Texas). That- or it splits up some other way peacefully, divorces itself into a multitude of insignificant statelets