Immagration

I would like the debates on immigration to include its cause and effect relative to over population both domestic and foreign, drugs, terrorism, the food supply and the maintenance of a healthy human resource --  and yes, the evolving environment of over-crowding 50 years from now. What is sustainable, and what does it take to maintain a civil society in the US? As Yogi Berra said, "If you don't know where you are going, you won't know when you get there."