This paper examines how immigration reshapes national identity through a multidisciplinary lens,
drawing on history, sociology, political theory, and cultural studies. While the effects of immigration on
economic and urban systems are well documented, its influence on national identity remains under
analyzed. This study examines the historical context of immigration across different national models,
from civic to ethnic-based identities, and considers how immigration policies reflect and reshape these
identities. By employing social identity theory and the dual identity framework, the paper uncovers how
group perceptions and integration processes impact collective belonging. It investigates the demographic
transformation of immigrant populations, their socio-economic contributions, cultural integration, and
political reception in both Western and non-Western societies. Through case studies in Europe and
North America, the research highlights tensions between inclusion and exclusion, nostalgia and
pluralism, and nationalism and cosmopolitanism. The findings suggest that immigration acts as both a
challenge to and a catalyst for redefining national identity in increasingly pluralistic societies.