Basically this is true of every modern race today. You go back far enough you see male foreign invading force fucking the local females (out fucking the local males). Europeans, Indians, Africans, Chinks. Compare the Y chromosomes to the mtDNA and they are usualy of different origins. You could ask why females are so disloyal to their local males. But you also have to ask why foreign males want to fuck “strange “ in the first place. Two sides of the same coin. Theres been little introgression historically in america of black males in to the white population. Quite a bit more of the reverse. Much less than in catholic L. America though. They had laws about that sort of thing here, and I dont know if there were comparable ones in places like brazil or mexico.