How can citizenship education drive social change and international solidarity and enable human-centered advancement to become embedded within a nation? How can education be a leading force for peacebuilding in the era of online platforms acting as new social agoras for transactions, freedom of speech, and hate speech? There is a strong belief in the power of education as an instrument to address social concerns and act as a driver for equity and change. As a state prerogative that remains highly dependent on national political agendas and governments' positions, education is widely praised as a path toward virtuous social patterns that can shape contemporary issues. Peace, justice, and democracy - words that raise passions but that also shared blurred lines between their corresponding theories and practical applications - shape a model for ethics and a common good that people must learn in the form of skills, ideas, behaviors, and competencies. The book, originally the author's PhD thesis, examines how education, and particularly citizenship education, has an important role in the process of building sustainable peace, transforming international cooperation and bringing about lasting security.