[refurb]

If immigrant Nigerians do well, what type of discrimination are you talking about? It can't be based on skin color if what you said is true.

[Retric]

Sure it can as long as it makes success harder but not impossible. You are looking at a self selecting population which need not look like the norms of either the US or Nigeria.

Really, immigrants and the direct children of immigrants tend to do well in the US as long as they are not part of a mass migration.