People in a city can comfortably walk and bike in many cases, and take public transport in most other cases. I do, because I live in NYC. But the US has very f

People in a city can comfortably walk and bike in many cases, and take public transport in most other cases. I do, because I live in NYC. But the US has very few cities proper (mostly those which grew big before that advent of the car), and even those have uneven density and thus efficiency of walking or taking a bus. A ton of what the US taste call cities is sprawling low-density almost-suburbia surrounding a few high-density "downtown" areas. See Houston, TX for an impressive example. Biking in such places is possible but tiring, walking is mostly pointless unless you visit your neighbor or a park, and running a subway is uneconomical. Hence, they resort to cars.