From the “Christian” refugee machine, flowing with Goobermint Dollars.
1 chess master for every 10,000 welfare teat suckers.
Not a very good ratio.
Honestly, you're misinformed when it comes to Nigerians. Do a bit of digging.
https://www.ft.com/content/ca39b445-442a-4845-a07c-0f5dae5f3460
They are ridiculously successful in general. There is some significant tension between Nigerians and African-Americans at some ivy league schools because the Nigerians are earning rates of acceptance that make for a higher percentage of "black" students, and some African Americans resent that the Nigerians are taking slots they believe should be reserved for them.