Amazon Tech level
Technological advance doesn´t come naturally. The most time the tech level can stay the same for centurys. The extrem development of technologie in the West in the last 2-300 years seem to be a exception. May be a culturell thing. The obsecen always to build a better mousetrap. Antic culture wasn´t very innovativ. They surly could have build a steam engine . They just didn´t care.