It's a common myth, that some people believe that the US can already make everything it needs but is not doing it because China is cheaper. So now that China is more expensive thanks to tariffs, all these US factories are going to boom and create millions of jobs.
Except a lot of these factories don't exist in the US, at all. For reference, the whole US has only 1(!) rare earth refinery. Meanwhile China has 90% of the global refining capabilities.