Is Polarization Genetic? (The Biology of Belief Trilogy, #3)

Is Polarization Genetic? explains why the United States has become increasingly divided on social and political issues since the 1970s. This third book in a trilogy explains why contrasting liberal and conservative psychological traits evolved as an advantage that gave Stone Age ancestral groups more options for solving problems and competing with other groups. However, an environmental change at the end of the last ice age diminished member collaboration. Without collaboration, once-benefi...