the best way to curb illegal immigration is to build a thriving middle class in the countries of origin. like mexico. not necessarily in our hands, and it will take time.
in the meantime, with the housing slump we are in right now, wouldn't be surprised if a lot of guys are going back home ... because of layoffs. there are only so many guys who can mow lawns and prune trees, etc.
don't forget that illegals have to buy stuff. they pay sales/consumption tax like the rest of us do. not sure that is embedded in a lot of cost-benefit assumptions.
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