Don't know, and not sure we ever will until there's a way to get a handle on who they are. (From what I've heard, Bush's proposal may help with that.)
"Minimum wage (if they get even that) won't be enough to support them."
Possibly, but I doubt they think they are owed the same things as Americans do. We're a spoiled nation.
"So there will be more cries to raise the minimum wage and create 'assistance' and 'outreach' and 'this-aid' 'that-aid' programs - further expanding the scope of government. It's the nature of the beast."
Quite possible. And we'll have to deal with them as they arise.