Not at all. We just don't have enough healthy young bodies who want to do hard labor. As I have said, we are having fewer children and those we do have are getting educated and do not want to do landscaping work. There simply are not enough young American bodies to do the work that legal and illegal immigrants are doing.
Yes there are. Like I said, the market would look different, but it would be fine.
The overall population would be lower, but so would the overhead in government assistance and health care. All this illegal workforce does, in the end, is ensure the present level for government assistance. More working Americans, less big brother.
THAT'S the true agenda at work here.