This work offers an unprecedented view into not just what governs our political battles, but why these battles have arisen within our species in the first place. From showing how these two strategies adapt in other more complex species in nature, to examining what genetic and neurostructural mechanisms may produce these divergences between individuals, to showing what this theory indicates our future may hold, this work is the most thorough analysis to date of just why we have two political ideologies, why they will never agree, and why we will tend to become even more partisan in the future."--Provided by publisher.