They build smack in the middle of neighbourhoods with white/Anglo saxon/European people and they know that those people don't want to be around them, so they move and guess what happens.
Muslims move in and shit on the area.
look no further than Brampton as a prime example, while it wasn't the majority of Muslims, it still gives you an idea as to their scheme and it works.
It also brings down the value of real estate in the area and guess who moves in?
https://www.nationalgeographic.com/magazine/2018/05/being-muslim-in-america/
It's not coincidence.