I still remember the walmart ads.. They showed the item, then told you where it came from and showed you the plant that made it. Always US based.
Now your hard pressed to find ANYTHING made in america at walmart (or target, or anywhere else for that matter)
It certainly doesn't help that our own government puts up so many roadblocks to actually making anything the USA that it just simply isn't worth the effort to do so anymore. I don't blame retailers for that, they are simply reacting to the negative consequences of US policies.