Cities are becoming incredibly dense, busy, polluted, and loud that nobody wants to live there anymore. To solve this problem people move outside of the city to what we call the "suburbs". .
The "suburbs" often consist of dense neighborhoods, the local mall, various strip malls, and sub-divisions. All of those places are often part of a suburban community. From these suburban communities people move back and forth to the cities, which creates a demand for more roads that adds to the sprawl. Each year millions if not billions of dollars are spent to build-to-build sub-division housing all over the United States. Sub-divisions are densely packed houses of the same or very similar design that are set together in a neighborhood/community. Sub-divisions are easy to build, go up fast, and occupy a lot of land as well as serve the basic living requirements for a single person, couple, or small family. Sub-divisions were created by society for those who are more lazy and don't want to make as many decisions about living accommodations. The houses are all set and only minor changes need to be made to them because they are pre-designed, eliminating the hassle for the buyer. Aside from being pre-made they are also cheaper than designing and having a house built.
Al Gore said it well when he said: “Development has become something to be opposed instead of welcomed; people move out to the suburbs to make their lives, only to find they are playing leapfrog with bulldozers. They long for amenities that are not eyesores, just as they long to give their kids the experience of a meadow, that child's paradise, left standing at the end of a street. Many communities have no sidewalks, and nowhere to walk to, which is bad for public safety as well as for our nation's physical health. It has become impossible in such settings for neighbors to greet one another on the street, or for kids to walk to their own nearby schools.