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Dalhousie's tenure as Governor-General spanned six years, from 1848 to 1856. His administration was marked by significant reforms and infrastructure development, including the construction of railways, telegraph networks, and public works projects. Notably, he implemented the Doctrine of Lapse, annexing several Indian kingdoms under British rule. Dalhousie's contributions left a lasting impact on India, shaping its political landscape and laying the groundwork for future developments.