This article examines Constitutional Moments and Missed Opportunities: Charter Design Failures in Post-CPA South Sudan: An African Union Perspective with a focused emphasis on South Sudan within the field of Political Science. It is structured as a review article that organises the problem, the strongest verified scholarship, and the main analytical implications in a concise publication-ready format. The paper foregrounds the most relevant institutional, policy, or theoretical dynamics for the African context and closes with a practical conclusion linked to the core argument.