Apart from the fact that the article doesn't support the point you're trying to make, as pointed out by other answers, historically, we have an excellent exampl

Apart from the fact that the article doesn't support the point you're trying to make, as pointed out by other answers, historically, we have an excellent example of an extremely successful empire that embraced diversity and stuck around for, depending on how you look, a couple of millennia, namely Rome. Embracing diversity was a key factor in how Rome managed to expand and conquer it's (typically significantly xenophobic) neighbors. Rome co-opted territories it conquered, giving the conquered peoples a path toward Roman citizenship, while crucially giving Rome manpower for its armies. In more detail: https://acoup.blog/2021/06/11/collections-the-queens-latin-or-who-were-the-romans-part-i-beginnings-and-legends/ https://acoup.blog/2021/06/11/collections-the-queens-latin-o...