>>509208932 (OP)its been done lots of times in communist countries. when the bolsheviks first got into power they popularized 'free love', made divorce super easy, mocked marriage and opened up state run child care and orphanages everywhere while also legalizing abortion. Then, when war was looming, the state did a 180 and started pushing how awesome having kids was and raising them in strong families for the good of the motherland.
China has obviously gone through its one child policy days to now, when its desperately trying to encourage its people to have some kids.
But neither of those places decided to import a new population from the 3rd world. thats something only the suicidal west is doing.