That is arguably because US cities suck. They don't have good public transportation, the kind that even well to do people choose to ride regularly like they do in say Tokyo, London, Switerland, Netherlands, etc.. They also don't have good bicycle infrustructure. And they have lots of crime or crime of the types and amounts that get people to want to live in the safer suburbs. Even the cities in the US are usually designed around cars, not people
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