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How did Mizoram change from part of Assam into a union territory?

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Map highlighting the northeastern Indian state of Mizoram in orange, with its capital Aizawl marked. Surrounding countries including Bangladesh, Myanmar, China, Nepal, Bhutan, Pakistan, Afghanistan, Iran, Sri Lanka, Thailand, and the Maldives are shown in relation to India, with major bodies of water like the Arabian Sea, Bay of Bengal, and Indian Ocean labeled. — Mizoram Mizoram, India.

Mizoram was historically administered as the Lushai Hills District of Assam following its unification in 1898. After India gained independence in 1947, the region remained part of Assam, but growing discontent among the Mizo people regarding their political autonomy eventually led to an armed rebellion by the Mizo National Front in 1966.12

This insurgency compelled the central government of India to intervene. In response to the unrest, the government assumed direct administration of the region and formally separated it from Assam to establish it as a union territory in 1972. The region later achieved full statehood in 1987 following the signing of the Mizoram Peace Accord in 1986.12