No no no. Nationalism distracts from economic reform.
There may be some social utility in nationalist restrictions on immigration in a society with a strong sense of commonality. Like Iceland or somewhere, perhaps.
The positive effects of such a cohesive national identity don’t appear to be operative in this country, which automatically divides its people into White, Black, & Latin. We don’t see ourselves as one people. Juan García from Houston is cousin to Ramón Ramírez from Managua. Shaniqua Owsley from Chicago is cousin to Brenda Luttrell from St. Vincent. Jim Schoeberl from St. Louis is cousin to Uwe Mueller from Munich. But Jim, Juan, & Shaniqua are “different races” in this country. The national boundary is less important* in the eyes of the people* than the lines between ethnic ancestries or languages.
Sure, you can get Black Anglos to resent lighter-skinned Latins, if you push a wedge. But Latins will often help other Latins, & USA Blacks will connect with other Blacks from the Caribbean as their own kind. And Whites will connect with white Europeans as their own kind. Their are finer ethnic distinctions, sure, but even then, a Finnish-American is cousin to a Finn.
So the spirits of the people mock this national boundary you think is important.
The reality is that to some White Anglo ruling-class type, Africa on the other side of town is almost as foreign & possibly more hateful as Africa across the sea.
Even within a color group, the working class do not have so many brothers or allies in the ruling class.
Real economic reform for working-class people, in a democracy, requires powerful organization. Like labor unions & political parties. More working-class numbers in the political arena can help.
Unfortunately, due to the self-perception of Yanks as three races, immigrants from any race other than the majority are looked at as fearsome aliens, just like the minorities that are already here. And here the trouble really sets in.
I don’t know what to do about it other than to fight against racial, ethnic, & yes, national-origin “othering.” A racially partitioned USA would soon be a poor & abused Black-istan next to a rich & nasty White-istan, which would probably be supporting street gangs & terrorists in Latino-land, assuming the last were allowed even to exist.