Here's a good outline of the issue, from the Atlantic. The previous Administration was not able to overcome lobbying opposition and nothing changed.
I noticed this about 10 years ago when I wanted a very short USB charging cable. The only ones available in the US were twice as long as I wanted. I found some on Amazon that were sold and shipped from China. I could buy ten of them, the size I wanted, shipping included, for less than half the cost, excluding shipping, of one cord twice that length available in the US. I ordered them. When the package arrrived the postage shown on the package was somewhat more than the total I'd paid for the cables plus shipping. I couldn't figure this out except if the shipper was not really paying the amount shown. Nevertheless, to ship a package like that in the US would have been far more expensive than shipping it from China.