You can argue how many cyclists and related vehicles there are in the grand scheme of things but there are a fair number of pedestrians at least during the day in (most?) US cities--that are meaningfully cities and not effectively suburbs that have a mayor.
Do they? Excepting for New York and "last mile" pedestrians, I haven't noticed that tendency much.
Although I also haven't been to any major cities in the southeast, so can't speak to them, and I haven't done any studies, so my impression could very well be mistaken.
Big cities I've been to in Europe, though, tend to have a lot of pedestrians and bicyclists.
I tried walking around sun belt cities. Would not recommend. Just looked at the top 20 american cities by population. I would consider 6 walkable or bikeable. Maybe 7 I've never been to columbus.