First of all, the cycle of decline and fall of great White empires would never have manifested. Egypt and Sumeria would not have fallen, North Africa and the Middle East would all be White, as would India. The race of Arabs would never come to be, as they were the result of racemixing that occurred in the decline and fall of those areas. Expect no Ottomans in such a world-line. White relations with other races would eventually become very stable and simple, Whites the uncontested masters, and the other the inferiors to different levels. There'd be some contest from Jewy whites and people resisting conquest, but in the endgame, it's an ethno-globe for white people, with other races living below them, either as a perpetually occupied people, slaves, or second class citizens. then white genes will absolutely bleach the nonwhite populations over time of white dominance, leading to a world where most people are of a majority white DNA profile, and most of them will look white too. Descended from the niggers will be a population of blonde or red haired, blue or green eyed, people who are the image of aryan breeding, with less than a hundredth of their genetic profile in unexpressed nigger DNA to mark their origins.