Can we pave the way to world peace through education of the next generation? This paper focuses on how teaching social and emotional learning (SEL) skills in schools could promote the positive development of children and youth so that they can choose prosocial, nonviolent ways of building relationships with others. First, research on how belonging and fairness develop early in life is briefly reviewed. Then the authors introduce SEL and the research supporting its impact, and explain how it can be supported through various strategies in the classroom, including programs, teacher--student relationships, cooperative learning, approaches to discipline, and solving problems and dealing with conflict peacefully. Building peace by promoting social and emotional development through education offers hope for future generations.