Earlier quoted context omitted.
The aerial picture of downtown Houston with all its parking lots is a favorite to show the deleterious effects of mandatory parking minimums: http://www.cdandrews.com/2014/09/surface-parking-lot-design-...
In the same blog I linked (different article I think) they actually noted that the downtown has no mandatory minimums, but it needs lots of lots because there are mandatory minimums elsewhere and everyone has cars as a result.
It’s not an accident that Texas looked more like Montana in 1900 than California. The mass adoption of automobiles and air conditioning made large cities in Texas possible; and the low population density made land cheap.
The centers of most big southern cities were never walkable. Most of those cities would never have existed without cars. I don’t know how you introduce density into a situation like that, and I don’t think zoning rules would be able to undo the damage of the last century. These cities were built around cars, and you can’t just roll that back without remaking the whole city and displacing many, many people.