Gross Domestic Product = Consumer Spending + Business and Residential Investment + Government Spending - Trade Deficit.
I can believe that illegal aliens "contribute" several hundred billions of dollars to the costs incurred by government. Oddly, I don't feel grateful.
A little bit of imitating whirling dervishes?
The industries most dependent upon ILLEGAL immigrant, government-subsidized "cheap" labor did about $800 billion. I bet is the truth. They were before the millions and millions came and they will be there after the millions and millions go home. I bet.
I will defer to others however with an explanation and some hint of a source.
According to BEA 2003 Gross Output by Industry in Current Dollars (total = $19,732.8 billion)
agriculture (farms) was $223.8 Billion
Accommodation and food services $549.1 Billion
Total = $772.9 Billion
Note:
construction was $954.8B but there was no break out for residential, etc.
Other services, except government was $472.2B but there was no break out, etc.