Gotta pimp phx's TL Stop the Plague of Sprawl and TheMann's Transport America and The Land of Milk and Honey for discussions of common-sense alternatives to OTL sprawl.
Milk and Honey butterflies dergeulation really getting going by Reagan getting thoroughly discredited by Iran-Contra and trying to crush PATCO and not getting re-elected in 1984.
I'll retread my response to Stop....
@Orville-- you're right, the post-war VHA loans and grubstakes sitting in everyone's mattress after the war did a lot to fuel the post-war suburban exodus.
However, the US housing stocks had effectively been frozen from 1929-1945 due to loans being nonexistent and corrupt zoning commissions really not allowing either enough new projects or renovation projects to go forward.
Those commissions gave a lot of Americans a sour taste of planned developments and trusting City Hall or state governments to be fair, honest, and efficient.
Millions of Americans were displaced during the Dust Bowl, the Depression and WWII, and saw how easy it was to build new with all the modern conveniences faster and cheaper during WWII...why stay in the same old town or neighborhood?
So, find a way to butterfly the Depression, and also find a way for planned communities to be politically, economically, aesthetically desirable things.
I saw a doc about the Pruitt-Igo project in St. Louis where at first, it was racially-mixed and you had a broad spectrum of middle-class, working-class, and poor residents.
However, in clearing the slums, poor residents had nowhere else to go, the jobs moved out to the burbs or disappeared, nobody planned for maintenance or upkeep (rents were nowhere near enough to account for depreciation and all federal subsidies stopped once they cut the ribbon-oops), so by the 1960's it'd become a hellhole where anyone who could move did.
The folks left were marooned w/o hope and to comply with the capricous and silly welfare eligibility requirements, family structures and culture of work completely fell apart.
So say, you're the master-planner for s/t like Pruitt-Igo. You have to make sure it's good for everyone, jobs and shops and amenities are handy, there's a sense of community and individual pride.
You can only do so much to predict how things will change over time.