Consume Product

Production capacity has dropped in recent decades as free trade truly took off and international 3rd world communities proved they can produce a "good enough" product. Their "good enough" actually assists with the concepts of consumption and planned obsolescence. If china can only build a phone that lasts 3 years that is actually beneficial for selling more phones.

That said, production capacity can and will increase if it is incentivized, such as through large tariffs. As we're seeing now with car manufacturers now working to open, or reopen, localized manufacturing facilities. The US has large areas of land that can be used for manufacturing.

Automation is an aspect, and depending on what is being produced it is quite viable but expensive. It would really depend on the exact product being used, however costs would certainly be higher producing in the US than importing, UNLESS importing those goods cause a tariff high enough it pushes the cost above simply hiring local US staff.

The US has no need for immigrants. The advantage of immigrants are another lie the globalist push. Immigrants do increase the GDP of a nation, drive down labor costs, and drive up consumer demand. However those improvements are only of value to the top 0.1%. For the rest of society immigrants add nothing to long term stability as normal people have 0 need for actual economic growth. Immigration could be dropped to 0 and there would be a more sustainable growth through simple reproduction.