Do you really think a CEO of widgets made in China sits around and says "I am not going to focus on selling more widgets to Canada, Mexico and Germany because Americans buy enough". Really? Of course not, they want to sell all the widgets they can, everywhere.
If you do trust me, not how it works. Manufacturing is all about economies of scale. The more widgets the lower cost each one becomes. Its different for commodities priced at the margin, but not for widgets.
So there is no where else to focus on, and even if some company didn't in the past, there is no other market with consumers that have the free income to buy most of this junk.
For 30 years the China apologists used to say "just wait, China is going to become consumer economy and they won't need to sell to us". Never happened. Not going to happen now either - there population is in decline.
Were the junk buying landfill filling consumer of last resort - for the world.