Source of the picture(, from the 50s) : https://www.thecrimson.com/article/2017/9/28/the-bitter-pill
Their argument in short was that an increase of population lead to poverty which in turn lead to communism.

National Security Study Memorandum 200(, 1974 only though)

« At a conference held June 20-22, 1952, at Colonial Williamsburg, thirty-three participants discussed the world’s food supply, industrial development, depletion of natural resources, and potential political instability arising from unchecked population growth and unanimously adopted a resolution to establish a foundation to deal with population problems. », this led to the Population Council, founded on November 7, 1952, by John D. Rockefeller III.
Its (successful )goal was to reduce the fertility rate over the world.

In 1958, « The Draper Committee (established by President Eisenhower to study US aid, including military aid), reported to the Senate Committee on Foreign Relations that the ‘population problem’ was the greatest obstacle to the world’s progress, and recommended that aid to developing countries be tied to population control programs. »

That post would probably benefit from more arguments, but that’s apparently a solid historical fact, and the only question is how much that argument weighted. It’s possible that birth control would have existed without these arguments.

In any case, this policy did happen all over the world(, source), fertility being divided by 2-3 and barely hovering over 2 children per women except in Africa :

(just a reminder that the european share of the world population declined, while North&South America, as well as Asia kinda, stayed constant :
)

I.d.k. if it’s an interesting post, i was just surprised to discover that 🤷

Merry christmas b.t.w.