For that matter, it hasn't been all that long since around 90% of the people were agricultural laborers -- pretty much world-wide before the European Renaissanc

For that matter, it hasn't been all that long since around 90% of the people were agricultural laborers -- pretty much world-wide before the European Renaissance and Enlightenment, and in many areas of the planet, well into the 20th Century. Generally unfree laborers at that (i.e., slaves or serfs).