In a historic political shift, the Bharatiya Janata Party (BJP) has captured power in West Bengal, ending the long dominance of Mamata Banerjee and the Trinamool Congress (TMC). Once a marginal player, the BJP steadily expanded its footprint through grassroots organisation, ideological mobilisation, and sustained electoral gains from rising vote share in 2014 to a major breakthrough in the 2019 Lok Sabha elections and a strong opposition position in 2021. This victory not only dismantles Mamata Banerjee's aura of invincibility but also marks a significant milestone in BJP's eastern expansion strategy. It reshapes India's political landscape, transforming Bengal from a difficult frontier into a major stronghold for the party.