There's a different choice than a civil war that's possible if folks want to split into smaller countries.
No country is indivisible if folks want it that way.
But I don't think there will be a white homeland any time soon. Unless Idaho or Montana decides that is what it wants for itself.
Thinking about it for less than a few seconds, I don't see why they shouldn't have such a country, myself. It might help relieve the tension if white people who want to see only white faces have somewhere to go. Maybe make an all black country too for the people that want to live like that. And a native American one, although those already exist eg the Navajo Nation.
For myself, I like more of a mixture. But making a multi-racial, multi-cultural country work smoothly hasn't necessarily been something anyone has achieved yet. It's a project we work on. And I don't necessarily think "Hitler" when people aren't happy with the way things are.
White supremacy is silly, dangerous and hateful, of course. But I don't think anyone should feel ashamed of their skin colour, or imagine white privilege is a thing either. If folks claim there's white privilege, they shouldn't be surprised that the folks they accuse resist and/or decide they want to live in a different country where that won't stand.