The yellow threat: myth or reality?

I don't consider myself a racist, but there are a lot of newcomers in my city. I'm not talking about those who come to study or work honestly. There are already plenty of people who cause more trouble or try to sell dubious services. Mostly, this category includes people "living in the south," but there are also more and more Chinese people. This threat is illusory until they reach a "critical mass" and gain voting rights.