So where and how does it end, you ask? One look at world history will give you the answer.
No country with a diverse population of different races, languages, and religions has long survived. Countries don’t naturally form with a diverse population, and when in the past they’ve occurred it’s usually been as a result of armed conquest. These unnaturally formed countries have either melded together into a single population made up of one mixed race with one language and one religion or they’ve come apart, and they’ve usually come apart with extreme violence. The longer these diverse populations were forced to coexist with one another without mixing and becoming one, the more the hatred grew among them and the more violently they broke apart, but break apart they did, or genocide has settled the issue once and for all.
Multiculturalism is the marriage made in hell—there is no getting out of it, not even by death because the hatred only goes on from generation to generation and century to century.