Welcome to the modern West, where the maintenance of Western civilization --now based on universal values, universal human rights and dignity and such-- doesn't require any actual Westerners at all. Hence, they can be replaced by Third Worlders and there's no loss. On the contrary, replacing them with strangers is the best proof that this is a Universal Civilization.
Nancy Pelosi, the flower of American Italian Catholicism, asserts that the arrival of every new immigrant --legal or "undocumented"-- makes us all "more American." So, really, we could fill up the territory of the USA entirely with Mexican, Chinese, Africans and Arabs and there'd be no loss.
In fact, without "native born" Americans, America would more American than ever!
The unfolding triumph of genderless* aka gay marriage is also praised, on a poster I saw, as now making us "more American."
So this is how it works: the less that the West and America looks like what the West and America used to look like --which was apparently just an accident-- the more Western and American it really is.
In one of the few correct things that Francis Fukuyama every wrote, he pointed out that modern liberal countries (aka White countries) which embrace pluralism and multiculturalism as an ideal essentially state that their identity is to have no identity at all.
Isn't that cool?
*I call it that because, in a brilliantly innovative discovery of universalism, it renders the most basic element of marriage, the genders of the spouses, irrelevant.