There are many places where you can live without a car. However they are overall a minority. Most people in the US live where living without the car is next to impossible. either there isn't any transit at all, or there is transit that only works for someone working 9-5 downtown, but you are still expected to drive a car for all other errands.

Yes in the core of a few other cities (New York is most obvious) you can reasonably live without a car. Most people don't live close enough to the core though.

The bad transit options is the first thing that needs to change. However nobody actually cares about that. Democrats are more interested in union jobs even though it drives costs up to the point where it isn't cost effective. Republicans don't even realize that it would be possible to have useful transit and so they fight throwing good money after bad.