Every attempt at analyzing this for the US economy I have seen concludes that immigration is at best a wash for the people who were already US citizens. It does

Every attempt at analyzing this for the US economy I have seen concludes that immigration is at best a wash for the people who were already US citizens. It does, however, have the effect of worsening income disparity. Capital benefits while low income wages are driven down. Of course one also has to consider environmental costs.