I'm struggling to understand why it is odd to you that Nigerians don't suffer from systemic racial policies that took place before they were ever allowed to enter the country. And why does the existence of Nigerian success befuddled you as to how those racist policies affect American descendents of slavery, Jim crow, and the myriad of racist policies throughout American history? Are you under some weird belief that there were 0 consequences from generations ofbracist policies? You can literally take redlining maps from the 20s, 30s, 40s, and 50s and trace them perfectly along impoverished and high crime areas today and have perfect alignment. Why would Nigerians immigrants (or any black immigrants) be affected by that sort of trauma? You should no more expect Nigerian immigrants to be affected by that specific set of racial trauma than one would expect Slavic immigrants to be affected by it. You have a poor understanding of the black American experience and have a woeful lack of understanding (or curiosity for that matter) of how that experience might still affect folks today.