What metaphors are used in Savage Inequalities: Children in America's Schools by Jonathan Kozol?

Camden is located just across the Delaware River from Philadelphia. Once the center of railroad and shipping traffic for other East Coast cities, it falls into disrepair when GE, RCA Victor and Campbell's move out of the area. Now it is the fourth poorest city in America. Like the other troubled areas mentioned in this book, the streets are filled with destroyed buildings, liquor stores and other dangerous businesses. The schools in this region are a total wreck. Schools in nearby Cherry Hill and Princeton offer a vast array of classes and opportunities. Camden serves as a metaphor for the broken American dream.