This isn't entirely the case, but the reality is actually no different. Long story short, a major reason that most of the US interstate freeways exist and have been built the way they have been is because they will stand up to moving heavy machines, like tanks. There's long strips of straight Highway that can be used as runways.
The highway system was built so that in the event of a civil war, domestic uprising, or invasion, the military could more or less operate very adequately anywhere with a decent stretch of highway available, and some way to get there.
Until then, automobiles rarely had to travel very far each day, and couldn't really run any faster than a few dozen miles an hour, partly because of the challenges of the terrain.
Automotive companies then took advantage of the newly built infrastructure and sold faster vehicles that could drive farther....
So blame who you want, but it was a joint effort between the civilian government, military industrial complex, and capitalistic automotive manufacturers, that drove (pun intended) us to where we are now.