I see this is an old thread, but one still active. The essential point is that a people should try to preserve their character. That is a legitimate goal of any people. An immigration policy should reflect this. Any other policy is insane, driven by neurotic impulses, not rational analysis.
For a succinct statement on immigration, see Immigration & The American Future.
Three of my grandparents were immigrants from Eastern European lands. I am not against immigrants. That has nothing to do with the issue. To make it very clear, when my grandparents were accepted into this country, their duty shifted from one to the lands of their births, to America. My duty as an American is to preserve the character of America. That is so clear to anyone who is not driven by some sort of warped agenda, that it should not need further development. And the ethnic character of America, while influenced and in someways enriched by peoples from other lands, was basically defined by the Founding Fathers, whose values understood in depth, reflect the ethnic history of the Anglo Saxon, Celtic and Dutch peoples to a predominant extent, with a bit of Huguenot thrown in.
It is a noble character. Why would anyone want to assail it; why would anyone want to undermine it; why have some such a problem acknowledging it and the centuries of struggle that went into its definition?
William Flax