Anyone who didnt see this one coming just wasnt looking, as one look at world history would have revealed that no country with a diverse population of different races, languages, and religion has long survived.
Countries dont naturally form with a diverse population, and when in the past theyve occurred its 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 theyve come apart, and theyve 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.
The same will happen to the USA.