[skulk]

That chart does abysmally little to support your claim, for a few reasons.

1) How many of those people in the green live on less than $5 a day? $1.90 per day is an absurd and arbitrary limit which feels cherry picked to make a Pinker-esque pleasing chart.

2) It hardly goes back in time. I'd like to know how happy hunter-gatherers were 20k years ago. Maybe I could go ask the North Sentinelese but I think building a time machine might be easier than getting a straight answer from them.