Interesting. Historically large families were inspired by no birth control plus the high death rate of children plus the desire for family workers on the farm. Immigration policy can optimize the last point. As to mass hysteria inspired by propaganda this article is a good starting point. However the new rules in Ref states causing doctors to not follow best practices will increase death rates among child bearing age who miscarried. Perhaps that should be a consideration. Not Doctors are leaving Red states so don’t assume just because you have money you are safe.