Aboriginal law applies to many parts of the continent, and they have a great deal of autonomy over the running of this land. They don't turn it into Vegas though, I don't know why exactly. (no, they have television, so I've lied there)
The slaughter of the original inhabitants was very organised and in one state led to virtual extinction. But they were less practiced in the art of warfare compared to the North-American Indians, and this fact meant their enslavery (for want of a better word) was so comprehensive.
I deleted my original post on this topic so for those wondering what the hell is going on, SASless is replying to an invisible post.