most of the Black DNA in those populations is from the Black mothers not fathers which tells you something... there was a lot of rape. combine that with the fact that they used to castrate Black men in some of those nations... No other Black populations that spread around the world have their Black genetics primarily from women only not men.Argentinians all but decimated their black populations over the centuries. They had an agressive immigration policy to bring in Europeans as a way to "whiten" the country (especially Italians, Spaniards and Germans post WW2 ). Also there was some war they fought down there and they took advantage of that by sending black soldiers to a near certain death.
Middle-East is the first place where enslaved Africans were sent, long before the transatlantic slavery happened. Arab-Muslim slavery started like 7 centuries before the Chiristian-European one. So to this day you have certain populations that retain that heritage and some of the phenotypes. All the way further to Iran or India.
I want them to have explain this history one day