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Simple answer: They were too few. Writing, wheels, cities and kingdoms became only necessary after the population reached a certain density. The Aborigines inhabited Australia since ten thousands of years, but hadn't ever changed their way of living. They just didn't need any cities or writings.

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Let's see, reproduction over 194,000 years would be very very high.... where did all the children run off too? There must have been huge cities as far as the eye can see. What happened to it all, as there is no trace.

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