It was the great manufacturing prowess which made America great, but for long while, US businesses were outsourcing anything they could.
Now, the chicken are coming back to roost!
China make the entire system for all its products - not just the lone factory churning out a particular product where parts come JIT from different sources, like now in the US.
It basically manufactures or imports the raw materials which make the tool to make the tools to make a part which goes to another plant which is attaches the part to another which goes ... and then to the plant where the final product is produced. Usually, its all just one huge sprawling plant, employing 100s of thousands of workers.
This was the model that Henry Ford created and we forgot.