All I am going to say is this, nets. Applied to the blacks- it's not allegedly, its not maybe. It's fact. It's bore out by the empirical evidence- whether crime and murder rates, single motherhood, education levels, median income. Non immigrant blacks significantly under-perform every group out there. Immigrant blacks tend to very well. Which suggests culture. Which is racist. Anyways.

Now in explaining this issue you can come back and say it was racism (which i find unlikely, considering Nigerian immigrants outperform every single group out there including some asians and all whites), or slavery, or drug laws, or whatever the popular theory floating around sociology departments today. But don't deny the basic facts or act somehow shocked about what everyone knows to be the state of affairs.