The choice for the USA is a wall at the US border or a wall around everyone's neighborhood like they have in south america.
The super rich nomads with their globalist agenda currently control US foreign and domestic policy. If US middle class interests don't reassert some control over US foreign and domestic policy then this country will be sold into the same kind of slavery as they have in south america. ie tiny upper class slim middle class and huge underclass.
This is one possibility I've thought of. Our elites want more cannon fodder and more demographic weight to take on China in the future. This is about the only reasonable reason for the flood of illegals that I can go along with. Personally I think that's the 3rd or 4th reason they like open borders. It's mostly to enrich the corporate super class. Insane trade policies and insane immigration policies enrich them/impoverish our middle class. Our middle class (and poor) completes the circle by joining the American forces and fighting for our corporate interests which can sometimes be the same as the interests of the American people