"The economic downturn – along with more aggressive enforcement – is reducing the flow of illegal immigrants to the United States.
Not only are fewer people – mostly Hispanics – slipping into the United States, they're getting fewer jobs. New data shows that Latino participation in the labor force – normally among the highest – has dropped along with a decline in new arrivals."
http://www.csmonitor.com/2008/1230/p03s07-usgn.html