First of all, your question seems to be presuppose that humanity in its "normal" state has some non-black skin color and that blackness is a deviation from the norm, demanding an explanation.
However, Aboriginals have dark skin for the same reason Europeans have light skin, North Africans have medium skin, and Sub-Saharan Africans have dark skin: adaptation to to climate. Natural selection has tended to favor dark-skinned individuals in tropical regions. Obviously southern Australia is far from the Tropics, but this, one can guess, indicates that Aboriginals "became" black at some point in their history whilst living in a hot sunny climate in Australia or elsewhere (i.e. Africa).
Some people think they somehow came from Africa and most of the natives peoples in Africa are black, so that could be a contributing factor.
Aborigines are indigenous to Australia. The correct term for Austalia's indigenous people is "Aboriginal and Torres Strait Islanders".
There are actually six aboriginal groups of Canada according to the History for Canadians Organization. They are the Arctic Aborigines, Sub Arctic Aborigines, Woodland Aborigines, Plains Aborigines, Plateau Aborigines, and the Coastal Aborigines.
In the 1800s, the Tasmanian Aborigines started to be systematically decimated by the Europeans. Their land was taken, and many were relocated to some of the Tasmanian islands. The last full-blooded Aborigine died in 1876.
Desert-dwelling Aborigines dig for tubers and yams at the base of the plentiful vegetation that lives in many of Australia's deserts. As Aborigines must live near water, many of them have access to nardoo, a fern that lives along the inland waterways, and which can be ground into a floury substance and cooked. They hunt red kangaroos and wallabies that come to the waterholes to drink, perentie (large goannas) and birds such as budgerigars.
Aboriginal Art comes from Australia The aborigines (original inhabitants of Australia) are the creators.
of course it was black [Aborigines]
he thought they were wild cruel black savages
Australian aborigines have diverse physical appearances, including a range of skin tones, from light to dark. It is important to recognize that their identity is not solely defined by skin color but by their cultural heritage, history, and connection to the land.
Aborigines
The Australian Aborigines had a rich variety of colours to use in their artwork. They incorporated earthy browns, reds, yellows, orange and white, as well as black, and shades of dark green and violet-blue.
The British invaded the Aborigines in 1788.
They used yellow,red,orange,white,brown,black,purple and dark green.
Native Australians are referred to as aborigines.
The Australian Aborigines used earthy colours such as reds, oranges, yellows, browns, and black and white to decorate their instruments.
Aborigines Advancement League was created in 1957.
Aborigines in White Australia was created in 1974.
Aborigines' Protection Society was created in 1837.