"Do we have large Muslem slums in the US?"
Take a drive through Patterson, NJ or parts of Brooklyn, NY. At the very least, we have large enclaves.
Bay Ridge, Brooklyn, used to be almost entirely Italian, now, there are so many burka-clad Muslims and mosques everywhere that people call Bay Ridge Bay Ruit.
it's really sad, it doesn't even look like America anymore, and no one speaks English.
Ed