her long-term “dream is a hemispheric common market, with open trade and open borders,”
So the Rats can flood the country with uneducated, unskilled, unscreened, welfare recipients who will vote DemocRat for the rest of their lives.
Even more basic, it will provide our non-working rulers with people to work for them; they just want populations to dominate (preferably ones without historical/cultural attachments to individual rights and such). Red China and Islam are envied by Western governments for their lock on their populations; there is no moral justification for recognizing and trading with Red China.