Feminism is about empowerment and choices. Being empowered to choose not to get married and have kids as I read it, considering that in the Western world that was "a woman's role" for probably centuries. At least as long as we've had patriarchy, which is quite a while.
Once women have the freedom to choose not to get married, have kids, etc it seems likely that some choose not to and thus the rise of feminism is roughly correlated with a decline in birthrates.
I've tidied this up in a nice little causal package but it's quite likely not so clear cut. But it certainly does seem that way at a glance. Which is why the notion gets such good traction amongst some.
Once women have the freedom to choose not to get married, have kids, etc it seems likely that some choose not to and thus the rise of feminism is roughly correlated with a decline in birthrates.
I've tidied this up in a nice little causal package but it's quite likely not so clear cut. But it certainly does seem that way at a glance. Which is why the notion gets such good traction amongst some.