@shortstories it's not culture, it's opportunity. Women have been proven to have fewer children the richer and more richer and educated they are regardless of culture.
Look at Iran, which is a theocracy with morality police, but the women work and earn their own money so their birthrate is shit even with a strict abortion ban.
Meanwhile orthodox jews and the Amish have 7-10 kids per family.
This isn't rocket science. It's just that women's rights are too sacred to question.