The study aims to comprehend and analyse the effects of the 1962 conflict on Indian federalism with reference to the Indian frontier state of Arunachal Pradesh. The entire NEFA (North East Frontier Agency), now known as Arunachal Pradesh, was occasionally claimed by China, causing the conflict to spread to parts of Northeast India. After the 1962 war, there was a noticeable change in government strategy as the Central Government became aware of the State's geostrategic importance. Although the McMohan Line conflict was dormant, it became more heated in the late 1950s with the escape of the Tibetan leader, the Dalai Lama, into India. Analysis of the Centre’s development from a minimal to a maximal level of governance in the area becomes crucial post-1962. Beyond infrastructure and social development, the Sino-Indian War of 1962 had repercussions, notably the nationalisation of the frontier region.