The Americans disappearing from these areas are often post-Christian pagans; that is why American families are becoming a rarity. My town (about a dozen miles north of Union NJ) put up a “bark park” for the ageing childless Americans a few years back; a little further south they had built a new soccer field for the children of the “replacement Americans”.
If whites native Americans were subsidized as heavily as the 3rd work replacements, they’d have kids too.