Some of the companies retain their American source of pork meat and we're told that the only change is the ownership.  But China has been buying the pig farms that supply the meat.  The meat may originate from the US as far as we are told, but I suppose they could import their meat at some point in the supply chain.  They could also sabotage our food if it ever came to that in their world domination attempts, all it would take is a well designed virus.