The history of Aboriginal people beings precisely 74.000 years ago during the collapse of the first human civilization, at that point they have lived in a high urban culture in Africa, they left the continent and settled in Australia where they remained relatively isolated from the affairs of the world.

Yes, the Aboriginal people erected several large cities and a unique civilization, though once they had an extremely advanced level of technology they never severed their connection to nature, they're also the only known civilization to knowingly abandon their technology.

At one point for reasons unknown they've simply left their great cities, machines and vehicles and migrated into the hinterland reverting to the tribal state they're in ever since.

The climate combined with poor soil quality.