That's called autarchy and it's economic nonsense.
It's the equivalent of each family's producing everything for itself. It that sounds too ridiculous to you, then how about each state's producing everything for itself. If not, why not?
Why should the US produce everything it needs if people in another country can do it more efficiently? Spending our capital on unprofitable production just makes us poorer than we might have been.
You are engaging in economic nationalism. Oh, it's patriotic to be sure, but it doesn't increase our economic well-being.
I guess the Chinese can produce our tanks, aircraft and ships for us in the next major war with THEM. .
If we produced only 25% of what China produces for us we'd have how many more industries , technology , factories and jobs in the U.S? How does that hurt the U.S.? What are we producing now because of you free traders:DEBT, non profits that are useless and rely on government grants, government jobs that are useless and grow the debt, debt, more lawyers, most new “jobs” are people on welfare,foodstamps, social security , government jobs,disability, non profit jobs : All of which produce NOTHING but add more debt. You think that is sustainable then you are totally misinformed.
Take the consumer electronics industry which is just one industry out of many that China has stolen from the U.S. In just one product of that the ipad how many technology jobs would come back to America ? Not just the factory workers but programmers, accountants, managers, process engineers, electricians et. And then all the parts for the ipad like the chips and processors ,and the supply chains and supply chains for each part so on etc. : All have gone to china for thousands of electronic products but they could be here in the U.S. . Instead we produce environmental studies with government grants.