the inscriptions from the workers of the time reveal most were not slaves and competition between the teams was one of the main drivers as evidenced by their bragging about their abilities to complete more than others... also you don't need that many people to move the stones if you run them over rollers. it can actually be done with small teams. the scale of the pyramids is incredible but they are far from needing an overly technologically advanced society. it's a fucking rock stack. the simplest for of building.
Canada