Enclaves have existed in this country since the very beginning.
Come on Ken. I am certain that at one point in your life you visited Hamtramck and were amazed at store after store where all the signs were written in Polish and no English spoken anywhere. Every big city has a Chinatown. Fully one fourth of the country was Mexican at one point in history and their influence is written in city names and streets everywhere, yet we act as is they just dropped in over the past couple of years. People from various ethnicities and cultures will naturally gather together as they seek understanding and comfort in any new culture.
I generally try to avoid participating in any of these politically charged threads, but pandering to people's lowest fears for personal gain or perceived status is below us in every possible way as a nation. We have plenty of real issues to confront that can be addressed without such commentary.