The Game Plan

First you make it so hard on your native population that those who are responsible and would never take charity or government handouts stop having children (by necessity, because they can't afford them). Then you talk about the population problem you have deliberately caused because there are no longer enough births to sustain your country. With birthrates so low, you must import laborers. Those workers are forever in your debt for rescuing them from Third World conditions and once given voting rights are the block that keeps you and your chosen successors in power permanently to keep importing their relatives. Of course, this is just the paranoid fantasy of right-wingers.