Book excerpt: By blending serious research with relevant contemporary examples, Our Political Nature casts important light onto the ideological clashes that so dangerously divide and imperil our world today. It shows how political orientations arise from three clusters of measurable personality traits that entail opposing attitudes toward tribalism, inequality, and differing perceptions of human nature. Together, these traits are by far the most powerful cause of left-right voting, even leading people to regularly vote against their economic interests. Our political personalities also influence our likely choice of a mate, and shape society's larger reproductive patterns. This book tells the evolutionary stories of these crucial personality traits, which stem from epic biological conflicts. Based on dozens of exciting new insights from primatology, genetics, neuroscience, and anthropology, this groundbreaking work brings core concepts to life through current news stories and personalities.