I dont want to talk about things that I dont know (blacks in the US), but we do have the same issues here in Argentina.
I think the problem is not color, its a social problem, and with social I mean social-economic problem.
People from Argentina are white. In most south american countries people are not white, are black (we say black). Its not the same black, is a brown. Still, we say black.
Argentina has a lot of immigration from these countries (Bolivia, Paraguay, Peru and so on). These people are usually poor. A few years ago a study said 70% of all the people that in "villas" (poor houses) are not from Argentina.
And that is the problem. Its not the color, its the fact that they are poor. So people dont like them. Is that racist...call it whatever you want...
The issue is so big in Argentina that if during a soccer game the fans start to sing: Boliviano!, the game has to be stopped, because a persons country has become an insult.
This kind of racism is usually related to poverty, to immigrant stealing jobs, crimes, welfare, etc.
I worked with people from many south american countries and there are no racist issues, because at the end, our social economic position (not sure thats the word Im looking for) is the same. When the position is different, thats when racism appears.
Many white people have problems in african countries.
Ok, I dont want to write a book here...