This study provides a comparative analysis of how the phenomenon of migration is framed in the discourse of leading American and British think tanks. In this regard, a method based on qualitative content analysis and discourse analysis of reports published by American and British think tanks in the period 2015-2025 has been used. Think tanks such as Brookings, CIS, Chatham House, and IPPR are among the most important think tanks whose reports this study focuses on. By comparing discourses, policy briefs, and recommendations, this research highlights convergences and divergences shaped by institutional contexts and national priorities. The findings show that the approach of these institutions, despite the common theme, is strongly influenced by the historical context, political priorities, and identity concerns specific to each country. On the American side, the dominant discourse defines immigration mainly in terms of national security calculations and economic gain. This view views immigrants as human capital or risk factors in the strategic equations of a global superpower whose main concern is competitiveness and control of transnational threats. In contrast, British discourse, deeply influenced by the Brexit experience, frames immigration more as an issue of national sovereignty and social cohesion. Here, the central question is about control as a symbol of political autonomy and the impact of immigration on collective identity and the capacity of public services. This research shows how the language used in these texts plays a role in the construction of political reality. Ultimately, the study concludes that these discursive differences have produced quite distinct policy trajectories on both sides. The American strategy is focused on the optimal management of migration in the service of national goals, while the British strategy is engaged in redefining itself through border control and social engineering. This opposition has made migration an arena for the display of fundamental differences in national projects...