Electricity is getting more complex to hold up every year. Europe is a supranational network, and the chance for a blackout is growing every year as well.
If ever, it surely won't look like a collapse of a unified society. I think you are crying wolf really...
Wait for the next Lehman event. The collapse will undoubtedly be a global one in a globalized society. The USA is not working anymore without China et vice versa. A Bankrun, and the whole society comes to a stand still.
China is surely not as dependent on the USA as the latter on the former. Even if the USA disappeared entirely one day, China would go on.