Does your country have immigrants takng over neighborhoods and driving out natives?

In my experience, "no" would be the short answer to the question. To the extent I've ever personally seen it, it has actually been the [i]richer[/i] immigrants from certain countries forming little upscale enclaves in large metropolitan areas. It is not really unsafe to go to such places, but you will be shunned as an outsider, and I suspect would have some difficulty buying a home in such an area if you were foolish enough to want to try to fit in there.

There are definitely places I've been that I consider fundamentally unsafe on account of the people occupying them and would not willingly return to, but none of them that come to mind were so due to immigrant populations.