Around the time of Deng the CCP realized that strict collectivization wasn't a recipe for economic success. Also around that time, a far more sociopathic strain of executive was coming into the boardrooms of American companies, one who wanted things as cheap as possible, externalities (like the American social fabric and economy) be damned. Tienanmen Square proved that the Chinese were willing to crush rabble rousers who desired political and economic reforms.

So American investors dumped a metric crapload of money into the Chinese economy for things like manufacturing. The labor was cheap, and anyone who wanted better outside of the status quo was going to be turned into hamburger under the treads of a tank. No longer would they have to deal with the labor unions of the Midwest and Great Lakes regions, or have to deal with American environmental, corruption, and labor laws. The investment was the seed money for the startup we know as modern China.