Sub-Sarharan DNA in Europe

There is some admixture of Sub-Saharan African DNA, due to the Early Modern African slave trade It shows a decreasing cline from the southwest to the northeast, which corresponds with the areas most involved in slave trade. Not every population has been studied yet, but enough have so that a picture is starting to emerge.

The amount of black admixture in Europe today ranges from a few percent in Iberia to almost nil around the Baltic.[40]Achilli et al. 2007[41] used generally large samples of numerous populations to come up with the following frequencies: 10.84% in the Southern Portuguese, 6.4% in the Central Portuguese, 3.7% in Northwestern Spaniards (Galicians), 3.19% in the Northern Portuguese, 2.9% in Central Italians from Latium, 1.9% in Central Italians from Tuscany, 1.9% in Southern Italians from Sicily, 1.68% in Northeastern Spaniards, 0.99% in Greeks from Crete, 0.98% in Central Italians from Marche, 0.83% in Finns, 0.71% in Bulgarians, 0.69% in Bosnians, 0.68% in Central Spaniards, 0.64% in Basques, 0.6% in the English, 0.54% in Italians from Sardinia, 0.44% in the Swiss, 0.3% in Southern Italians from Campania, 0.3% in Frenchmen, 0.3% in Germans and 0.18% in Poles.

No admixture was detected in Northern Italians from Lombardy and Piedmont, Southern Italians from Apulia and Calabria, Greeks from Lemnos, Rhodes and elsewhere, Germans from Bavaria, Austrians, Russians, Romanians, Czechs, Estonians, Latvians, Slovakians, Slovenians, Ukrainians, Danes, Irishmen, Welshmen or Scots.

Sub-Saharan African Y-chromosomes are much less common in Europe, for the reasons discussed above. The small presence of the Haplogroups E(xE3b) (i.e. clades of E other than E3b) and Haplogroup A in Europe is almost exclusively attributable to the slave trade, as these haplogroups are characteristic of western, central and southern Africans and are barely observed elsewhere.[42] Haplotype A has been detected in Portugal (3%), France (2.5% in a very small sample), Germany (2%), Sardinia (1.6%), Austria (0.78%), Italy (0.45%), Spain (0.42%) and Greece (0.27%). By contrast, North Africans have about 5% paternal sub-Saharan admixture.[43]

This does not mean everyone from those regions have black ancestry. It simply means that some do but it's extremely low. Check out Chicago or New York and you would be looking at more than 50 percent.