Over the long term, the demographic shift is dependent on Welfare. How many kids would an inner city girl be interested in making, if she had to support all of them by the sweat of her own brow, working at MacDonalds?
BTTT! Wow! Go to the head of the class. How many babies would she want to make if she had to do it alone, by the sweat of her brow, with no assistance from the welfare-riding sperm donor?