This is changing, manufacturing is moving to Vietnam.

The reason why is because China is cheap. The CCP purposely deflated it's RMB so to attract foreign DTI. Direct trade investment. It also supported financing projects of infrastructure, factories and easy money lending in China in lieu for hiring chinese contractors to build in Chian and in turn then fuel the Capitalist West products that are made in China but "designed in USA" and then that knowledge is spread among other people in China in a copy/repeat system.

There's more, but it's mostly that, good education, focus on science, and he whole no religion thing and being a communist state meaning easy peasy to built factories, no right of way and no time consuming court system, no true intellectual property protection, and of course cheap labor.

With the emergence of good factories, also came good supply chains that were consistent within a single city so things can be deigned, built, tested and redone on scale, easily. Mini silicon valeys in a way.

Then transportation, highway, and then the Chinamail/EMS being subsidized by USPS to help offset delivery cost.

Vietnam is now the new star. :D