Definitely USA and Europe are built differently. I'd class most European city centers are medium-high density where smaller towns are still quite dense. Compare this to NYC where I am and Manhattan is higher density, but 2 hours drive away its normal to have a 4+ bedroom house on a big piece of land with bears and deer roaming around for a quarter of the price.

Walkable places are the exception in the US. Most old small towns were walkable at some point, and a handful of them have a walkable core preserved or restored, but otherwise it's something you'd only find in the downtown area of a major city. The overwhelming majority of housing is car dependent.