Earlier quoted context omitted.
Here's hoping the US isn't the one that collapses in on itself this time. My perception of China is that it's government makes life pretty terrible but it seems better organized over there (because of state control).
If we define a "collapse" as the rulers getting deposed by the opposition, then it happens in the US pretty often. When it happens in China things may get very messy.
Still, a civil war requires the civilian government to lose control of the military or a central military to splinter into regional militias. That doesn't seem likely in the US or China. Another scenario for a US "collapse" would be a military coup or some other end to the democratic experiment.