This article examines The Ethiopia-Eritrea Peace Deal: Diplomacy, Implementation Challenges, and Regional Implications: Evidence from South Sudan with a focused emphasis on South Sudan within the field of Political Science. It is structured as a theoretical framework 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.