Here we might be able to get a glimpse into part of the problem that the US is having with its immigration system, that certain jobs are linked directly with certain immigration status (in a sense of semantic interdependence). And thus, whenever someone who is a current US citizen loses his job, entirely (e.g. layoff) or partially (e.g. wage cut or reduced working hours), then an assumption based on equivalence arithmetic can easily arise for him that the part of the job he loses would be occupied by another person, who is very likely an immigrant, due to that 2nd degree link (from his perspective in reasoning) between job and immigration status. But the root cause for his job loss can be much more complicated (if we thinks a bit harder), and more real, than someone who was born in another country and fresh-off-boat took that job away (or stole, if the process was not a concrete thing that could be touched or seen)...Then suspicion, hatred, and sometimes even aggressiveness naturally follow...

But the job market, in its traditional sense, can still shrink, as long as there is increasingly more automation and growing average productivity in our society, even if we chase away all the workers born outside the United States who are not US citizens, and build a wall to create a certain physical separation between us and them. But would we hate and become aggressive towards our new machines and our more productive way of working? Sometimes we would...But it's still much easier to do that towards a living person, especially when he is more vulnerable, legally, than us on our land...

Perhaps the most interesting point here is whether such exclusion, expulsion or isolation could eventually solve our problem...Admittedly, they really work sometimes, for us, and for certain other nations throughout the history, for this or other problem or "question" -- and this indeed is our problem (or at least we have a share in the overall situation) -- and perhaps it's not our responsibility to worry about what that would leave those who are not the "same" as us to...

But is this really the best solution? And best in what sense, and best for whom?