The developing world has birth control but, in large parts of it (e.g. most of africa), most people aren't using it. This is for economic reasons.
I would argue that in many, if not all, of these places this is instad due to poor education, misinformation or religious opposition.
Edit to add: It's also important to distinguish when men have access to birth control and when women have access to it. Fertility rates won't drop until women can control how many children they have.
I would argue that in many, if not all, of these places this is instad due to poor education, misinformation or religious opposition.
Edit to add: It's also important to distinguish when men have access to birth control and when women have access to it. Fertility rates won't drop until women can control how many children they have.