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This only shows you which modern population they are closest to. It doesnβt show Arabian admixture.Sudanese Arabs today are practically geneticall identical to Christian ear Nubians meaning that this Gigantic migration of Arabs that completely changed the genetics of people in the region didn't actually happen.
Also I am talking about autosomal DNA. You can have massive changes in y-dna and mtdna without a much change in autosomal DNA.
The nation of chad has majority haplogtoup r1b like western Europeans