For most of history, when a society gets richer, the rich enslave more people and consolidate power This is not true. The enormous rise in wealth of the world

For most of history, when a society gets richer, the rich enslave more people and consolidate power This is not true. The enormous rise in wealth of the world in the 20th/21st centuries has coincided with large increases in personal freedoms as well. At any rate, I'm not sure a graph from the US starting at 1950 is sufficient for establishing historical trends. The trend is consistent with other datasets: https://ourworldindata.org/working-hours https://ourworldindata.org/working-hours