Arunachal Pradesh and Mizoram received their statehood on February 20, 1987, following the 53rd Amendment of the Indian Constitution in 1986.
On 20th January 1972, the North East Frontier Agency (NEFA) was renamed as Union Territory of Arunachal Pradesh and on 20th February 1987 statehood was granted to Arunachal Pradesh. Mizoram was also a Union Territory from 1972 to 1987 before achieving statehood.