The problem is that our workforce population has been declining because baby-boomers (born 1946-1964 with peak birth years in 1959 and 1960) started retiring during the recession and naturally continue to do so. Yes they had kids (echo-boomers who were born from 1982-1999) and they have been entering the workforce population but there are more baby-boomers than echo-boomers though we aren't as screwed as Europe, Japan, or China because of the echo-boomers.
So some immigration is great because we don't want to have 3 retired people drawing Medicare and Social Security for every 1 working person, especially since politicians raided Medicare / SS when there weren't that many retirees yet baby-boomers working pumping money into the Entitlement Programs.
The ultimate question is what type of immigration do we want? Ideally, we want to see law-abiding and skilled people come from all over the world, new citizens who understand the Founding Principles of the country while assimilating easily.
The problem I have with the current situation is that we have an unsecured boarder to the South and the first thing someone illegally crossing the border does is break our laws, which doesn't make for a good precedent. Another problem I have with such aggressive illegal immigration from the South is the political pandering involved...it's been pretty obvious that *some* in the Democratic Party have been falling over themselves to win the Latino vote, which is a tragedy since it encourages the impression that excessive illegal immigration is ok (when it's really not).
