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Douglas_Knight comments on Crossing the History-Lessons Threshold - LessWrong
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The demographic transition is first observed in the 18th century, without what people usually think of as "effective birth control and safe abortions."
What do you think caused it?
As it happens I recently came across a blog post/essay on this very topic.
Methods used to limit fertility historically 1: Non-penetrative intercourse. Oral isn't new, and is very reliable. 2: very late marriages. 3: Prostitution and /unsafe/ abortions. (this is a really depressing bit of history...)