The political landscape of Tamil Nadu has witnessed a significant transformation characterised by the ascendancy of regional parties and the concurrent weakening of national parties. This research delves into the underlying factors contributing to this phenomenon and its implications for the state's political trajectory.Drawing on a combination of qualitative and quantitative methodologies, this study examines historical trends, electoral data, party manifestos, and socio-political dynamics to elucidate the rise of regional parties such as the All India Anna Dravida Munnetra Kazhagam (AIADMK) and the Dravida Munnetra Kazhagam (DMK), alongside the diminishing influence of national parties like the Indian National Congress (INC) and the Bharatiya Janata Party (BJP).Key drivers identified include linguistic identity politics, regional pride, historical grievances, charismatic leadership, and effective mobilization strategies. Additionally, socio-economic factors such as caste dynamics, welfare policies, and regional disparities play a crucial role in shaping voter preferences and party allegiances.The ramifications of this shift extend beyond electoral outcomes to governance, policy formulation, and federal dynamics. The dominance of regional parties has led to the prioritization of state-centric issues and the articulation of Tamil Nadu's distinct socio-cultural identity within the Indian federal framework.By offering a comprehensive analysis of the rise of regional parties and the decline of national parties in Tamil Nadu, this research contributes to a deeper understanding of sub-nationalism, federalism, and political decentralisation within the Indian context.This research follows a empirical research method and a total of 202 samples have been collected through questionnaire.
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