I have not even seen a good way to determine assimilation. It would seem to me that people who speak the language and pay their taxes (even if they don’t file, their employers are withholding the taxes–except for those good U.S. businessmen who pay them under the table), and buy products to live in this country are pretty well along toward assimilating. While the issue of bilengual education is sticky, I have seen no movement to build schools where children are taught only in Spanish–which differs from the 19th century where children were taught in German, French, and other languages for years.
I see no evidence that the assimilation rate is “less than it needs to be” because I see no evidence that it needs to match a particular rate (once we figure out what it even means).
I actually do not yet have strong opinions regarding immigration because, while much of the F.A.I.R. information open to dispute and many of the other sources are clearly xenophobic, I perceive that there may be a case made for immigration control or reform.
I am willing to consider the case for immigration limits.
Unfortunately, when it comes in the form of unsupported assertions that it is “too much” or that “they are not assimilating” my “where is the evidence?” detector starts beeping. Brownsville, Texas had a German speaking community well into the 20th century from an immigration that began before 1850. Detroit had been “American” since the 1790s, yet in 1896 Ste. Anne parish built its new école where, for a few more years students would be taught in French.
I do think a country has a right to control its borders. While there may be a rate of immigration that is too high, the 10.4% level of the 2000 census is sufficiently below the percentages of the first decades of the 20th century (which varied between 13.4% and 14.6%) that I see no reason to panic about these figures. Getting upset about the number of people who speak a language other than English at home seems pretty silly if they are speaking English when they go out to get jobs or run for office.
If the War on (people who use) Drugs has demonstrated anything, it is that trying to stifle illegal imports at the source is guaranteed to fail.
If you really want to stop illegal (or even legal) immigration, then make Mexico and Central America places where people prefer to live.
Now, if you want to start punishing the people who encourage illegal immigration–those paying wages under the table and using endoresements for green cards and H1-B visas as methods to employ slave labor, I will support you. Passing a bunch of draconian laws that punish the people who are most in need of assistance or spending billions to set up a wall with armed guards across the Southwest will not evoke any support from me and making wild claims about how the country is going to hell when I see far more threat emanating from D.C. than from Ciudad Juárez or Cananea will cause me to shrug off those claims as not well thought out.
The last I knew, those “Balkan” cities of Pittsburgh, Buffalo, Cleveland, Detroit, Chicago, and Milwaukee from the early 20th century were safely American. I need to see more evidence that there is a problem than simple cries that “they are not assimilating!”.