The article discusses the importance of regions, regional governance, and regional powers in the field of International Relations. It explores how power shifts between regions, the rise of regional powers, and changing institutional structures impact global politics. The research combines realist and constructivist elements to analyze the relationship between regional governance structures and regional powers, using Latin America as a case study. The findings suggest that regionalism in Latin America is complex, with multiple competing projects and organizations shaping the region's political landscape.