That yellow buffon has a far fetched mentality of bringing manufacturing jobs back to America.
1. Factories just cannot simply shift their production in a matter of a few months. They will have to plan carefully so that their new location is able to support them with a capable workforce, not to mention that training will still be required.
2. Don't expect America to manufacture low end items like bolt and nuts. Their labor costs will never justify. They have to resort to high end manufacturing. The best venture is to provide services, which Meta, Alphabet, Amazon, Microsoft and Nvidia have been doing with great success and also bringing wealth to these companies. All countries will eventually progress and face this same transition. Japan is also no longer a major manufacturing hub like they used to be in the 70s and 80s. China is also upgrading and their companies are relegating those low end manufacturing to neighboring countries. Likewise, Singapore is no longer a viable manufacturing hub for low end products and that's why HDD manufacturing has long gone. That's how every country will progress with time.
3. High end manufacturing are not a guarantee to a higher workforce and employment for its people. Companies are resorting to robotics and AI for more than half of their production and procurement processes. So, how is it going to induce more jobs for its people?
4. Why don't they ask that autistic Elon on why he opens Giga factories in China and Berlin? It's mainly because of lower manufacturing costs and favorable government incentives as compared to America. Also, their immediate downline supporting industries are readily available. It's inevitable that every company will want to make profits but not to suffer a loss where possible.
5. America doesn't have all the raw materials required and these will have to be imported. With the high tariffs imposed on steel, aluminium and lumber imports (for example), these will inevitably jack up the cost of the final product.