It hasn't happened because most in the US don't need or even want to live in pedestrian focused cities. Americans tend to live in detached single family homes.

It hasn't happened because most in the US don't need or even want to live in pedestrian focused cities. Americans tend to live in detached single family homes. Americans tend to want space between themselves and their neighbors. Americans do not see their cars as liabilities. Most people don't live in SF/NYC and/or don't read StrongTowns Replacing American suburbia would cost $100 Trillion dollars. More suburbia is being created every day, far outpacing investment in "New Urbanism". In America, when your city/suburb becomes blighted, you can move.