It wasn’t that long ago in the history of the United States that small communities made the world go round. Urbanization took a back seat to farming, fishing, hunting, and gathering fruit and vegetables from the wild. You would be hard-pressed today trying to survive in a big city if you had to grow, catch, and gather your own food.
The edge of the world’s oceans is the shore, and it is continually modified by storm times. It comes and goes, builds and jettisons. In areas where rocky land masses dip directly into the sea, the shore may be less than two feet wide on average. Where more sand is delivered than taken away, the shore, then the beach, can be hundreds of feet wide. There is no surface geologic formation in the world longer than the shore.