As far as I know, all Negros/blacks are of African ancestry.
I guess we don’t have many Australian Aborigines running around.
http://i.images.cdn.fotopedia.com/flickr-5444690703-hd/People_around_the_World/Oceania/Australia/Australian_Aborigines/Australia_Aboriginal_Culture_001.jpg
http://4.bp.blogspot.com/_NnvOI_SWsCE/TM-kPrmoE2I/AAAAAAAAAv0/iV7kqeG0-r4/s1600/australia-aborigines-460.jpg