It truly is a race to the bottom.
One theory I have as to why so much illegal labor is being allowed in is because that is another way of competing with the cheap, foreign labor. By providing it for corporations here in the states they may be less apt to move or be undercutted by foreign competitors.
The government now realizes that because of current globalist policies we run the risk of losing too many employers necessary to fund the government. Letting them have their cheap labor is better than them moving out or going bankrupt.
So where does that leave the American citizen? Basically competing for minimum wage jobs.