What is there to elaborate? Virtually everything you use in your daily life comes from China, and if it doesn't then it is built with parts from china. That includes clothes you wear and the computer you're using just now. China has massive $$$.
Europe has a total of around 730 million inhabitants. If you assume that 20% of these could serve in military (which is very optimistic) then that would be around 146 million. Assuming these are killed in a war, it would mean most of the young male population will be just "gone", Europe's population would be devastated. If 146 million Chinese died tomorrow, nobody would even notice. They would still have 1.2 billion people, and even with their strict birth controls they'd have replaced their losses in a couple of years.
Now the USA doesn't even have half the population of Europe...
But they need not go to open war. China owns most of the US industry and estate already anyway and is buying out Europe big time. For example, they've bought 70 chateaux in the Bordeaux area during the last 6 months, notably not necessarily the best wines but estates with good housing complexes. I'm mentioning that because it was big news there not long ago. China owns 1% of France's wine growing estate now. This does not sound like a lot, but considering they bought almost all of it within a year or so, it is. Now figure how many of them they'll own if they continue doing that for another 10 years. And that's only the high-profile stuff that you can see.
10 years ago, Chinese people were a "rarity" in a typical EU country. In Germany you rarely saw one at all. Now you'll find some in nearly every other street in every major and not-so-major town. They're massively buying property and bringing people into society. Soon they'll go into politics to influence legislation into whatever direction they desire.
Roughly 90% of toys for babies and children come from China. China has been exporting poisonous and contaminated child toys since at least the 1970s (probably earlier, but it's known since the 1970s that they put in non-neglegible amounts of lead, cadmium, pthalates, azo-colors, toluene, tri, and a dozen other substances that are not only harmful and possibly cancerogenous, but also reduce fertility.
Reducing fertility, what an ingenious idea. Why kill your enemies in war if you can just let your enemies die out "naturally"?
Those that don't die out will be too fat to fight. The ultra-high-glycemic diet will make sure of that. Surely it's a coincidence that China stocks all the healthy rice for themselves and exports the cheap, unhealthy types in masses.
Of course, if this ever happened, this was "accidential", and it isn't happening at all. But