If China cut trade ties with the US, which country do you think will still be able to produce everything it needs? People like to think of China as just a source of cheap consumer goods, but we are much more reliant on them than that. Every power plant has Chinese components that keep it functioning. Every farm, automobile, communication network, aircraft, factory.. they all rely on Chinese components and equipment. The list touches every facet of modern American life.
China could make the US unrecognizable within 5 years, without ever launching a single missile