Being here legally and spent 1/2 my life here. My folks sold everything to come here and bought every asset they have with them, and invest in this country, in the early to mid 90s when the economy wasn't that great yet.
I'm not saying that they expect welfare or payout, just that the fact is in this country a sustainable retirement is not really something achievable if you starts in the late 40s and early 50s. Fortunately I'm doing fine and they pay for my education, without government's help at all (private high school and foreign college tuition, higher than what you guys complain about right now as a local resident). We came as a middle class, and we are still in the middle class, without taking a thing from the US and have made our share of the GDP with the work we have done in this country.
Enough about myself, my main point is that many of those who were from this country, live here and work here the whole life, could easily get into a seriously dangerous situation because of the social structure in this nation. True, we make more money than other developed nations due to lower overhead and lower tax, but we are taking the profits and distribute it in an uneven way: higher housing cost (due to average higher income), higher health care cost, more lawyers, more on consumer spending than investing in infrastructure, larger military, more expensive education, more illegal immigrants to sustain the consumer spending (and the unpaid medical and education expense that the consumer have to pay for), higher crime rate in the slum, etc. etc.
In the end, I see that American as a nation could easily be surpassed if we stay the course. Most of my relatives and friends back home are doing just as well as us without coming over here, and their risk factor is not as high as in the US for all the sudden, unexpected things that could pop up, like my Dad's medical issue could easily bankrupt him if he could go back for the treatment.
I could see that we might end up being the old Europe super powers who peaked and start going downhill, or even the nation being bankrupted like the wall street recently.
There used to be illegal immigrants from Taiwan, Japan, and Korea to the US, now they are doing fine and the illegal kind of stopped. In probably 20 years the illegal from China will also stop if they keep improving the way they are. Depends on how Mexico is doing, they might stop coming one day too.