I spent a bit of time during some touristy native american stuff while i was in canada and alaska last year, those tribes are (were) WAY more advanced than the Australian native peoples that the comparision just doesn't apply.
Native americans built full blown cabins where aborigionals largely still lived in caves and temporary shelter. They had a far better chance at integration.
Yeah its sad whats happened to the aussie abos, but at the end of the day they, as a people, need to save themselves - they have been given whatever resources they need. And perhaps they are making progress like alcohol bans in some towns up north, mon-fri boarding schools for children so they get proper rest at night, and pouring money into aborigional art and expression (hip-hop, dance and so on).
The biggest problem is that a large proportion of this and the next generation of aboriginal kids will be growing up with fetal alcohol syndrome. those kids dont have a chance.