For the Nigerian immigrant, who did he or she mate with to produce the second generation, I bet most often it is an African American, who is descended from slaves. The slaves were bred to be strong but stupid and/or they were Africans who were dumb enough to be captured, remember Africans helped round up slaves, they were the smart ones. Obama was the son of a smart African immigrant, but his daughters are stupid because he mated with someone low IQ.