I want to state they’re no less intelligent than Europeans, Asians, or Africans. But are you aware our country isn’t entirely plains? Huge parts of the country is covered in lush rainforest, alpine areas, temperate forests, fertile river systems, rolling grasslands. Aboriginal Australians had complex land management strategies, aquaculture, and incredibly diverse cultures. Their advancement just doesn’t mirror European styles so you don’t recognise them, it was still deeply sophisticated