This book will deepen our understanding of the sources of hatred and prejudice among groups, adding a developmental and evolutionary perspective to explain how we convey our beliefs to the youngest members of our society. The Hamburgs explore the psychological obstacles to peaceful relations between groups and focus on the developmental processes by which we can diminish ethnocentrism, prejudice, and hatred, which children learn from a very early age. Scholarship and practice in international relations, including war and peace issues, have gravely neglected the crucial psychological aspects of these terrible problems and the educational opportunities that must be explored. This book is devoted to the promising lines of inquiry and innovation that foster a more humane and less violent development in childhood and adolescence. It should be of interest to scholars in the education community and to a socially concerned segment of the public.