Hmmm. The Elder Scrolls has been Bleached. White Imperials plus Breton, and Nord men are seen as the "desired" partner by women of all races.
Dark and High Elf women would be the most resistant to this alternate reality. Seeing their bodies ""defiled"" by these men as scandalous and extremely taboo. Though after being Bleached for the first time they would be the most ardent embracers of the change. With Dark Elves especially believing that it's their duty to ensure their partner doesn't stop at just them. As an added bonus, both races would be the most receptive towards enslavement as a means of continual bleaching.
Orcs would be the third most resistant but also the biggest proponents of Bleached harems. Their already polygamous nature easily translating into harem establishment and management.
Non white Imperial as well as Redguad women are the first to embrace the new reality. Imperial decrees celebrating the superiority of White Imperials would be quickly established. Redguards, having been under the dominion of the empire for ages, would also be quick to accept the changing landscape. Though the Redguard men on the other hand would be a different story.
Nords and Bretons would only notice the changes when their women would find an increased competition for their men
Argonian and Khajiit women, already used to being lusted after by Nords, would find the new reality more pleasant as they could chase the taboo of interspecies dating far more easily. Khajiit men would barely notice as even in this reality Skooma dealing as well as thievery is still a lucrative market.
The events of Morrowind, Oblivion, and Skyrim play out as usual. Though obviously, the theatrical boasting of their accomplishments would depend on what we would consider the "canon race" to be. If we go based off marketing. The Hero of Kvatch and Dragonborn both would be lauded as heroes but also as shining examples of white supremacy. Meanwhile , the Nerevarine would fade into the fabric of history as many of their accomplishments would be attributed to others or glossed over in official records. Depending on when this AU starts, the Great War after the Oblivion Crisis might have also been avoided. As the dominion of a white Empire would still be felt even after the crisis.