They could all be running operations in Mexico. That could have become the North American SZ.
Obviously we share theirs since we’ve shown were interested in cutting costs at the expense of quality.
This embeds a colonialist / Western bias presuming that Americans companies are leading the charge and orchestrating everything, and the natives are incapable of self organizing. This is opposed to American companies being customers, and Chinese companies offering them a cheap all inclusive solution with implementation details ( factories / labor ) already sorted out. Since you pointed out Shen Zhen specifically.