The population density is still radically different even when you cut the vast empty spaces between cities in the west.
I live in a midwestern suburb. In the land area that my house uses, you'd have 10-20 families in Madrid. Our idea of dense shopping is a two story mall, not stores under every residential area. And don't get me started with mandated parking spots in strip malls that aren't ever half full.
So unless you live in Manhattan or downtown Chicago, you don't see the same levels of population density.
Single fami