What you are saying is true and not true. Most people in the US live in a few urban areas. Interconnecting these urban areas with trains is super hard. However,

What you are saying is true and not true. Most people in the US live in a few urban areas. Interconnecting these urban areas with trains is super hard. However, inside these urban areas the situation doesn't have to be that different from other countries urban areas. However, I believe that US suburbs are uniquely spread out and unwalkable largely due to boneheaded zoning.