Actually, I was thinking global population. (And immigration--legal or not--is actually keeping this particular country from facing the same underpopulation problem that Japan is currently.)
And this is where we differ. I went to war and fought for this country. I pay taxes for the benefit of MY COUNTRYMEN, not the world. People who come here illegally are stealing from me. When they go to the hospital and do not pay, they raise my insurance rates. When we need more infrastructure for electricity and water and sewer, tax payers provide this along with schools, roads, and police protection.
When you come here and use these services and not pay taxes, you are stealing from me, just like walking into my home and helping yourself to a sandwich, a beer and my wife.