Currently, the US is an individualist nation i.e. the individual is able to pursue their goals in the best way the individual sees fit. The idea of a unified national economy exists only on paper, or perhaps doesn't even exist at all. This is clearly exemplified by the lack of regulation in the financial system. If one can get wealthier by sale of imported goods at a cheaper price compared to the price of the US product, they will do that without hesitation, despite the fact it damages the national economy.

Obviously no one in their right mind thinks that. That view is only shared by xenophobic bigots. A division of cheap labor is the absolute best thing for the national economy. It is virtually necessary to keep the price of certain products low, if they are produced on a massive scale. Every country has such division, it just so happens that in the US those jobs are filled by undocumented individuals. If we remove all of them, only two things can happen. a) the price of certain products like farm products etc. will go through the roof to make up for the decrease in production and b) there will be a massive shortage of workers and eventually part of the lower middle class will sink down into what's now considered a lower/working class. Ironically they make up the biggest portion of those xenophobic idiots. And then they would really have a reason to complain.