Really? You don't think American factories can be built or re-tooled to produce the cheap junk Walmart now buys from China and Mexico? Do you think Americans have lost the ability, the knowledge to manufacture televisions, washers, dryers, smartphones, computers?
Seriously?
We destroyed our domestic industries years ago. Recreating them won't be simple and it won't be cheap. So where is the incentive for investors to sink the billions of dollars necessary to rebuild industries from scratch just so they can produce, as you put it, cheap junk for Walmart? How much of a profit margin is there in that, given the risks involved and especially when Congress could come along and repeal all those tariffs, making their investment worthless?