Describe the Setting of the Book

I have just started a book called Allegiant by Veronica Roth which is the third and final book of the Divergent series. So far, the setting of the book is still based in a dystopian Chicago. The entire series is a dystopian society in the future. Currently, Tris and Tobias are deciding whether or not they should leave the city and venture out to see what lies beyond the boundary fence. At the end of the second book, it is revealed there is a whole other world outside the fence and that the people who live in Chicago were placed there on purpose to eventually come back out and save and rebuild the old world which tore itself apart. I believe that sometime soon in the book they will leave to discover what's out there. The leader of the new government, Tobias' Mom, doesn't want anybody to leave. This means that they must leave in secret. Nobody knows what they will find out there but I predict it will be an anarchy with chaos nearly everywhere and a collapsed government. If anyone has any other predictions what they will find please comment them.