It is generally accepted that collective identity among member states in regional organizations strengthens peace, yet the process of constructing a collective identity can also reproduce conflict. Focusing on the European Union and the Association of Southeast Asian Nations, this book demonstrates how collective identity depends on the construction of outsider states, such as Morocco, Turkey, and Australia, as different, and in some instances, as threatening. It then analyzes how these regional organizations can consequently aggravate conflicts involving outsider states.