wut? Tribes have specialized warriors, and also would raid other tribes for loot and spoils of war which included slaves. This didn't need the creation of King

wut? Tribes have specialized warriors, and also would raid other tribes for loot and spoils of war which included slaves. This didn't need the creation of Kingdoms to achieve this. Man will come up with this at the proto-civ stage because other humans beings are the best tools. You also are drawing some sort of line of intent, that hunter gatherers knew to move towards agriculture, AFAIK the data on how the transition occurred is spotty and is still being debated. EVEN then, from tribal structures and from studying nomadis/hunter gatherers its clear that "men did work for others", at the very least for the good of the tribe, and often because the village headsman would be able to mobilize people to work on mutually beneficial tasks like say, a granary, or even a juju enhancing spirit walk. Bulk food also is something of a recent phenomenon, if you look at the chart of human population growth its balooned since around 1950, and before that the total human population of the world was nearly a billion people. And thats with the invention of the plough, harness, irrigation and so on. While agriculture was massively advantageous compared to whatever we had before, it wasn't without its own pitfalls - such as famines, droughts, pests, bad crops and so on. Finally your last para is at odds with the entire ethos of the USA for a large portion of its existence, that you could get somewhere with merit. Matter of fact its only in the recent past that this has stopped being true.