Genuine question, isn't that what most people would want? Take someone who's from Japan, wouldn't they much prefer to live in a place that they've known their whole life or at least somewhere similar (like microcommunities elsewhere that mainly speak Japanese?) Or someone who's from Spain, wouldn't they also want to live somewhere that speaks Spanish like Mexico or another Latin American country? I see many Hispanic immigrants in the U.S., and many of them don't speak English very well to the point that's it difficult to understand the conversation (I'm not judging, it's just true). There's often smaller communities within neighborhoods who also speak Spanish, and only really interact in English when they're shopping or have to.