I'm guess this topic is all within the context of growth in the US?
While I am a Mongolian citizen
I spend a lot of time in the US, so I wrote the above with that country in mind.
However, the principle applies to any country where people immigrate to for a better standard of living. Huge waves of immigrants, legal and otherwise, is not a "US only" issue. All over Europe, really any "first world" country where immigration enforcement is lax, would have the same situation.