State Historic Name Capital (s) Statehood Arunachal Pradesh North - East Frontier Agency Itanagar 1987 (earlier a Union Territory of India, constituted in 1971) Assam Pragjyotisha, Kamarupa Shillong (till 1969), Dispur 1947 Manipur Kangleipak Imphal 1971 (earlier a Union Territory of India, constituted in 1956) Meghalaya Khasi hills, Jaintia hills and Garo hills Shillong 1971 Mizoram Lushai hills Aizawl 1987 (earlier a Union Territory of India, constituted in 1971) Nagaland Naga hills Kohima 1963 Sikkim Sukhim Gangtok Tripura Tipperah Agartala 1971 (earlier a Union Territory of India, constituted in 1956)
the states of manipur tripura and meghalaya were formed in
1971 1971 1971 1971 1971