Earlier quoted context omitted.
I would not call ~20% of the US population an outlier. It's a very different situation from urban areas, but just as valid And even cities in the US are vast sprawls compared to organically grown very old cities in other parts of the world. That makes a huge difference for walkability.
Furthermore, the 80% urban stat from the US census gets routinely misinterpreted. Just going through some property line details with a couple neighbors on collectively about 75 acres plus adjacent conservation land. The census considers this urban. And, as you say, Urban != dense city downtown.
my point is, talking about Berlin and then carrying that thought over to "americans just love cars" is silly. Germany is smaller than CA, and double the population of california. Most people "in california" live in the "san angeles" range or in the "bay capital" area. a half hour outside of any of those areas and it's either sand or farms or mountains.
and i wish i was "rural", there's ~600 houses within 6mi radius, that's not very rural. It's rural compared to Manhattan, i guess.