After the war, Chicago knew that something had to be done to retain peace so 5 citizens stood up and spoke their mind to what they think cause war or what would stop war. These traits and skills to keep peace were made into factions and people were placed into factions on how they function in life and what they think keeps peace.
Divergent is a movie about a dystopian future where the fate of a faction lies in the hands of a 16 year old who is trying to find herself.