Failed immigrant assimilation can cleave a country into opposed civilizations

Evidence

Western culture is challenged by groups within Western societies. One such challenge comes from immigrants from other civilizations who reject assimilation and continue to adhere to and to propagate the values, customs, and cultures of their home societies. This phenomenon is most notable among Muslims in Europe, who are, however, a small minority. It is also manifest, in lesser degree, among Hispanics in the United States, who are a large minority. If assimilation fails in this case, the United States will become a cleft country, with all the potentials for internal strife and disunion that entails. — Samuel P. Huntington, The Clash of Civilizations and the…, 845

Categorization

• XREF: Connects to my earlier work on cross-cultural moral panics and the politics of dress; also to the ADDENDUM ‘Complaints About Immodesty Go Way Back’ which is about class/identity signaling across civilizations. — connects to: Failed assimilation attempts convert reformers into exclusionists — John Higham, Strangers in the Land: Patterns of…, 1583
• QUESTION: What evidence would show the US is or is becoming a cleft country on Huntington’s terms today, two decades after this was written?