Quite easily. Nobody needs a visa to employ black Americans.
I'm sure black Americans would feel somewhat relieved that they were not forced to compete with Nigerians.
>Because in the case of racial bias, people are shocked and horrified. Yet in the case of national bias, people aren't.
I fail to see why this horrifies you so much. White skin didn't pay for my education. The nation I was born and grew up in did.
It's no use pretending that employers are pro-immigration thanks to their worldliness and desire to help non-Americans, either. Nigel Farage in the UK represents the epitome of national bias yet guess what he did when he wanted to hire somebody for cheap? Yup, that's right. Immigrants.
>I'm attempting to point out that there are few good distinguishing principles between the two cases
Failing I would say.
>I've repeatedly said that "treat badly" means "threaten with violence for engaging in mutually agreeable trade" and "we" means "organizations that purport to act on our behalf" (US Govt, white supremicist groups, etc).
Ok, so I agreed - no violence towards Nigerians who come to the US looking for work. Perhaps a mild deportation, that's all (it's happened to me before due to a visa mixup and it didn't leave any bruises).