ABSTRACT
In this chapter, students will learn about the role of regional organizations in the provision of international security, the history and development of regionalism in the security sphere, and the evolving relationship between the United Nations (UN) and regional organizations. This chapter considers the conditions behind the growth and expanding remit of regional security projects, and explanations for their success and failure. As the world becomes increasingly multipolar and more states seek an active stake in the multilateral system, regional organizations are playing more important roles in a complex multilateral security architecture.
