I’m not trying to be a dick but this is just straight up false. The share of people living in metropolitan areas and cities have increased, but the density of those cities massively decreased after WWII and most have not recovered. For example, 20,000-40,000 ppsm in the core of a typical Midwestern city in 1940. There are only a handful of places with densities like that now, and they’re all on the coasts.