WI: Australia mostly or entirely fertile?

Suppose there’s no desert in Australia, and is instead mostly fertile grassland. Likely population? Could it be of similar power to the US? Would the natives still be conquered, or would they have a more advanced civilization?
 
With a more powerful native culture, I think there is potentially more of a chance of contact between the Australians and the peoples of the Malay Archipelago, which would tie Australia heavily to Southeast Asian influences, but since it is also its own continent, it would probably also take those influences and run with them to create a new culture of their own.
 

Marc

Donor
Suppose there’s no desert in Australia, and is instead mostly fertile grassland. Likely population? Could it be of similar power to the US? Would the natives still be conquered, or would they have a more advanced civilization?

Sorry, given the factors involved this really is ASB, akin to supposing that the Sahara desert didn't form - you are asking for massive climatic/geological changes.
 
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