was said:
Now there's a good point.
The Aztecs had the wheel, but they lived in terrain wheels were of little use in, and they saw no need to change things so they could use their wheels. The Spanish had wheels and had developed the technology, infrastructure, and society necessary for their use. They needed wheels, so they needed to change things in Central Mexico so they could use their wheels.
The first culture, the Sumerian, to use wheels had the good fortune to live in a part of the world where wheels could be used with little change to the environment. Southern Iraq is flat. Central Iraq is mostly flat. The highlands and hills (especially to the west) are gently sloped. Wheeled vehicles were useful, and soon came to dominate in transportation and trade.
Outside Mesopotamia was another matter. But, wheels proved so useful people figured out a way to get wheeled vehicles into areas they otherwise couldn't go. First by leveling a sort of track through rough terrain, later by developing road construction techniques that in ancient times culminated in the famous roads of Rome.
And yes, roads are built. Even something as basic as a city street is a complex construction project requiring many steps.
Then you have all the things that come with road construction. Surveying - of a type more involved than surveying a field, basic topology, soil chemistry, hydrology, civil engineering as a whole. What sort of load can the ground take? What sort of foundation is needed so the road can handle the expected load? What about drainage? Many construction techniques originally developed for roads would later be adapted to constructing walls and buildings.
And good roads opened up trade routes that would otherwise have been closed. Rivers are great at transporting goods and people, but they don't always go where you need them to. You've got the resources you can build roads that can go most anywhere. In Medieval Europe the problem with transporting goods by road had more to do with tolls than any other cause. With her strong cental government 14th century England could send more trade by road, and more profitably than any other part of Europe.
Roads are definitely under appreciated.