Stopping US import of any of these technologies doesn't suddenly make them disappear. They still exist. You can't "ignore them and they'll go away", this is real life.

And as an American citizen I am always hearing how bad it is for China to have a leg up on us in X, Y or Z, and yet our government is the one that is regularly saber rattling (and starting wars over!) the shifting economic realities of the US clearly being an empire in decline.

These days we also regularly saber rattle our own "allies" for fuck's sake.

Long past time to ask yourself if maybe we're the baddies.