The 20th Century has seen several breakthroughs to a fully-developed anti-natalist position occurring independently of one another. If we divide these breakthroughs up in terms of language regions, we get the following picture:
Kurnig, Guido Kohlbecher, Martin Neuffer, Karim Akerma, Gunter Bleibohm.
Philippe Annaba and Théophile de Giraud.
Spanish- and Portuguese-speaking world:
Julio Cabrera and Rafael Tages Melo.
Herrmann Vetter, David Benatar, Jim Crawford, Thomas Ligotti, Ken Coates, Sarah Perry and several others.
These anti-natalist breakthroughs were made possible by a large number of (cultural- and intellectual-)historical tendencies and occurrences which we will call “antinatalism-friendly conjunctures”. To name here just a few of these “antinatalism-friendly conjunctures”: the rise of a secular culture, in the emerging literature of which there were often developed critical discourses on God as bearing ultimate responsibility for the deficient existence of Man; the metaphysical thought of Schopenhauer and his follower and popularizer Eduard von Hartmann; nihilism; feminism.