... or wherever they came from.
There's such a clutter of empty containers on the docks (West Coast) that they can't unload the newest shipments until they make some room. I believe the (federal or state) government will have to step in and start ordering them to do this, because nobody is showing any leadership at the docks.
In addition there are serious manpower shortages among the dockworkers, and that's mainly due to Covid. (That's my guess anyway.)
Perhaps the U.S. Coast Guard can step in a provide manpower, and the U.S. Navy can provide ships to carry empty containers back to China? Just to get them out of the way....