Open, unrestricted immigration will be just that... the end of our sovereignty.
Of course it's already happening. George Bush and his handlers have deputized Mexican consular officials to decide who get's defacto legal status under their ongoing "matricula"-card stealth amnesty program.
Similarly, the overt amnesty plan Bush and Co. will try to shove down our throats this spring will have been seen and vetted by Mexican officials long before Americans can have a look at it.