Immigration becomes a problem if not done right, and looks like (from an outsider view) that was the trigger. I don't want to sound racist, as I'm an immigrant myself, and my family were all immigrants too. But when I immigrated, I knew I was going to live in a different culture, and I always tried to blend in. I think the problem is when immigrants try to impose their culture in a different place. People has always been scared of the different, even when different is not bad.