Well, precisely. And I imagine that many of the pollyannas on this forum don't know about Aztlan (charming how many hispanic people who are becoming our neighbors have a slogan of "For those inside the race, everything. For those outside the race, nothing"), or don't take seriously the threat of the Islamic conversion of America's blacks, in concert with the immigration of radical Islamics into the U.S.
No, I guess there's nothing different about this influx. So what that we'll be a nation of 500 million people towards the end of the century, and no culture will dominate. Everyone will get along. What will save us? The Constitution. After all, it's protection against any concevable ills, isn't it?
Vicente Fox definitely has his own reasons for offering "dual-citizenship" and setting up all the Mexican Consulates where his citizens are expected to go for their identification cards and everything else here in this country. He also insists that no matter how long his citizens live here that they are not subject to American law. The Mexican government is sending over it's textbooks for it's citizens here and many are being taught in all-Spanish classrooms. None of that is about assimilation or learning American values, history or the US Constitution.