This study provides an historical appraisal of the Economic Community of West African States (ECOWAS), examining its evolution, challenges and achievements since its establishment in 1975, the study explores ECOWAS transformation from a regional economic organization to a comprehensive institution promoting economic integration, peace and security in West Africa. This paper analyzes the challenges militating against the organization and the significant milestone achieved. The study obtained its data from both primary and secondary sources such as textbooks, journals and archival materials. The article recommends that ECOWAS strengthen its institutions, enhance its decision-making processes and foster greater co-operation among member states to address the regions complex challenges.