Mizoram and Arunachal Pradesh both became States on 20 February 1987. Mizoram, a Union Territory from 1972, gained statehood through the 53rd Constitutional Amendment Act, 1986, after the Mizoram Accord between the Centre and the Mizo National Front; it borders Myanmar and Bangladesh. Arunachal Pradesh, formerly NEFA, became a Union Territory in 1972 and a State under the 55th Constitutional Amendment Act, 1986; it borders Bhutan, China and Myanmar. World Day of Social Justice was also observed on 20 February with the 2026 theme 'Renewed Commitment to Social Development and Social Justice'.