I think some of the statements about the US are slightly lacking perspective. Yes, the country is large, yes there's "room" for another billion people. That's not the problem. Offering the point of view of a southern californian, "immigration" itself isn't a problem. And while illegal immigration isn't exactly a national problem, it is
local problem for states on the border with mexico.
For example, according to wikipedia:
http://en.wikipedia.org/wiki/Illegal_immigration_to_the_United_StatesThere are ~2.9 million illegal immigrants in california. Meanwhile, California's total population is
38.8 million.
Roughly 7.4% of the
entire population of the state of california are illegal aliens.
According to
pewreearch.org, illegal immigrants make up 5.1% of the total US labor force, and in california, it's 9%.
Is anyone going to pretend that that's not going to have a significant effect simply because we "have room" for more people?
Many of them are not culturally integrating. Many of them don't speak english. Lots of them are taking jobs leaving starving college students unable to find work. And companies that hire illegals favor it because they can pay under the table. I don't want to be defending the tax state here, but when it's 10-15% cheaper to hire an illegal, that does create a disincentive to hire people who are here legally.
It's also a significant health concern, as large numbers of them come from poor parts of mexico and southern american countries where vaccination and sanitation standards are poor. My grandmother once hired one as a live in nurse, and the woman would not put used toilet paper in the toilet. She would put it in the trash
next to the toilet, and no matter how many times we tried explaining to her that US plumbing is good enough to not break if you flush toilet paper, still she insisted on putting it in the trash. Many of these people have never been vaccinated for anything in their entire lives, they lack understanding of basic sanitation.
It might not be a national problem, but it's definitely a problem for states on the border with mexico.