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Pick up a history book.
Ghettos have existed across the ages and have produced vibrant & frequently prosperous societies. (L.A. before the Watts Riots, Harlem early in the 20th century, Warsaw before the Nazis, and so on).
People seek people like them just as much as people tend to marginalize or ostracize people not like them.
If you travel to Europe you'll find an expatriate American Community likely living within easy reach of one and another. When I lived in Asia I knew that I was in the American Ghetto, today we have freeway signs directing people to Little Tokyo, Korea Town, Cambodia Town, and of course, China Town.

You've never been to a German Town on the east coast??

The problem today is that ghettos and barrios no longer foster any kind of functional society: progressive politics make it far too profitable for some in the culture to encourage separatism & hostility to the detriment of the rest of that community.

Sorry, I left out mention of the hoards of very white agitators bulking out the ranks “protesters” we get to watch nightly on TV news.