Unified under what banner? White Confederate Christian Conservative Republican?
What is "American" culture? From one coast to another, there were English, French, and Spanish colonies taking over while the indigenous population was being killed off. We have cities ranging in ethnic names from NEW YORK to LOS ANGELES.
This has always been a multicultural society and it always will be. Why do so many white Americans tell immigrants to "learn English" when most white Americans can't form a coherent sentence in any language?
Immigrants must assimilate into the host country's culture....that includes learning the language and customs.....this is what you get when they don't....
^There are areas in France which no longer belong to the French State. The French government calls them by the euphemism Zones Urbaines Sensibles, or in English: Sensitive Urban Zones, or in plain English: No-Go Zones, or in even plainer English: Muslim areas.
Back in 2006 there were more than 750 of them throughout France with a government map detailing them so that if you were stupid enough to want to be raped, tortured or killed all you had to do was visit one of the areas listed.
Of course, this is not just a French problem; countries with more than 2 or 3 percent of their population Muslim have no-go zones. They're easy to spot: areas where police, fire, rescue, medical or government agents fear to enter because they are simply too violent and dangerous. That's right - too dangerous for even the police.
Eventually when there are enough of these Islamic mini-states, Muslims take total control of the entire country. This has happened to many countries in the past that were once non-Muslim.
Sensitive Urban Zones in France - Muslim Ghettos from Planck's Constant