alt Hacker News> 40% comes from Mexico and Canada
Where do you think this originates from?
China ships a rather large amount of stuff to these countries to take advantage of the trade agreements. So much that you can find satellite images of large yards in Mexico that are used for this purpose with barely any effort.
Okay, let's assume most of their steel is Chinese (I have my doubts because, yet again, more conspiracies), we only import a quarter of the steel we use. That would hurt losing it overnight, sure, but we wouldn't be absolutely toast like the autarkists are saying.
These takes are much more doomer than I'm willing to bet the supporters of "bring everything back" realize. Do you have no faith in the US economy / populace adapting to a hypothetical all out war with China?