Write an essay discussing two or three of the greatest challenges facing the United States today. If you like, you may refer to essays in this chapter, such as “ Just Walk On By” ( page 240), or to essays elsewhere in this book, such as “ Two Ways to Belong in America” ( page 404) or “ On Dumpster Diving” ( page 664). Make sure that you document any material you get from your sources and that you include a works- cited page.