Why do some societies evolve and adapt while others remain stagnant? What creates divisiveness and exclusion, and what leads to community cohesion and social progress? This book discusses the psychology of social system change and resistance to change, offering readers a deep exploration of the psychological dynamics that shape societal transformations. Readers explore psychological perspectives on intergroup relations and group processes, alongside interdisciplinary perspectives from environmental science, history, political science, and sociology, to question and challenge conventional thinking. This readable, entertaining book contains clear definitions, lucid explanations, and key learnings in each chapter that highlight the take-home points and implications, so that readers can apply these insights to their real-world challenges. Whether you're a student, scholar, community member, or leader, this book provides important knowledge for all who are interested in understanding and influencing the dynamics of social change.