Not all of it is due to slavery…Mainly due to slavery, the trans Sahara slave trade was notorious, even till this day you will find West African y and mtdna haplogroups across the western Asia.
Northern African has had many waves of Western Asian HG and even migration across the Mediterranean, they've kept up to 50% of the ancestral paternal haplogroup E-M81
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Meanwhile Europe got xooged.(I1 and G2 being the Early European farmers.) from Anatolia got annilated by stepppe pastoralist.
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