Who's erasing anything? Christ man, I said 1960s and cited the 1956 law that represented the profound changes happening then. And yes, news flash, this is postwar. Cut this disingenuous shit.
And yes, it was the postwar era that heralded these changes, leading up to an explosion starting thanks in significant part to the construction of the Eisenhower system.
Stop pretending that the prewar streetcar suburbs have ANY similarities to postwar era "suburban experiment" development. They have no bearing on each other. After WW2, out of terrible fear of returning to a major recession, the entire country instead devoted itself to massive, massive, massive debt spending to build entire whole-cloth developments, to keep the wartime economic machine going. We expanded vast highway networks to encourage longer-distance commuting. We offered incredibly cheap, government-guaranteed, 30 year mortgages for single-family homes. We began the process of cinching down hard to "urban blight" (i.e., poor, productive neighborhoods). We updated building codes with completely unscientific mandatory parking minimums. We made it increasingly illegal to build anything but R1a residential or huge apartment developments. We changed our entire urban model to the one everyone grew up with -- suburbs and strip malls.
And it all happened within the last century. Well within it. Postwar, starting in earnest in the 1960s and only starting to slow down in the last decade or two as more and more cities had the bills start to come due and have realized the total insolvency it has left them with.
You can show me a picture of pretty much any neighborhood in any city and I call tell you whether it was a pre 1940 or post 1950. The difference is dramatic and obvious and I don't believe you if you claim otherwise.