It was easier to pay a Chinese worker than an American worker mainly, and companies knew it for the last 3 decades, Trump is just spinning in circles here, he knows China isn't going anywhere, and he knows mainly due to technology of the future that the American worker as well as the global worker will be displaced. So guys like YANG with their idea of a universal wage isn't too far off. Trump people don't like it, but in 20 years when 50% of American jobs are displaced then people will be more accepting of these kind of concepts. In the meantime Trump is selling this nation down the road in concepts that will not work into the future. Many of his white supporters like his ideas, but they are not preparing for the future.
Then when Chinese workers started making more money, they went to Bangladesh, Vietnam, outside of China scamming our IT technology, this road Trump is taking us down, does nothing for us in the future.