So what do you think is the cause?

CON

Modern western nations have birth rates below replacement levels, Feminism is the cause.

https://www.debate.org/debates/Modern-western-nations-have-birth-rates-below-replacement-levels-feminism-is-the-cause./1/
score

BM25 score: 6.81
feminism: 6.81
conclusion: 4.96 (boost 1.50, idf 5.97, tfNorm 0.55)

sourceText: 1.85 (boost 0.20, idf 4.68, tfNorm 1.97)