That's a very interesting plot thank you.

Another very powerful demographic chart that I lost (in case someone knows where it is) is a 3 dimensional chart. Y axis is children per women, X axis is infant mortality, and then there is a slider to look at the evolution through time. All countries are plotted as points.

The reason it is powerful is because by moving the slider you can see the evolution through time. For most now developed countries, infant mortality and children per women both reduced simultaneously as the progress of medicine and the evolution of society have been very gradual. But african countries are following a different path, where the infant mortality collapsed but is not followed by a reduction of children per woman (only a few countries have started to take that turn). That is basically all you need to know to explain the major demographic shift we are about to observe in Africa.

Also Our World in Data: https://ourworldindata.org/grapher/fertility-vs-child-mortal...

It's exactly that, thank you. The version I saw didn't change the scale when you move the slider which makes it easier to see what is going on, but I am pretty sure it must be earlier version of that chart.

Nice plot, we should work on steepening those curves to a slope of greater than one

Is that drop in the earlier 1900s localized to the young the spanish flu?

I was thinking WW1

The Spanish fly/great war dip is staggering

And the sharp increase around the mid 1940s is quite remarkable too. I was wondering what caused that, I guess the polio vaccination started getting rolled out but I don't if it was that big of a cause of death.

"Methods for mass production of penicillin were patented by Andrew Jackson Moyer in 1945."

Antibiotics are a lifesaver to reckon with.

Ahhh of course :D