Post-independence
Upon independence, in 4 January 1948, the Chin Hills area was split from Arakan Division to form Chin State (Zogam), and Kachin State was formed by carving out the Myitkyina and Bhamo districts of Mandalay Division. Karen State was also created from Amherst, Thaton, and Toungoo Districts of Tenasserim Division. Karenni State was separated from the Federated Shan States, and Shan State was formed by merging the Federated Shan States and the Wa States.
In 1952, Karenni State was renamed Kayah State. In 1964, Rangoon Division was separated from Pegu Division, whose capital shifted to Pegu. In addition, Karen State was renamed Kawthule State.
In 1972, the Hanthawaddy and Hmawbi districts were moved under Rangoon Division's juridstiction.
In 1974, after Ne Win introduced a constitution, Chin Division became a state, and its capital moved from Falam to Hakha. Kawthule State's name was reverted to Karen State, and Mon State was separated from Tenasserim Division. Mon State's capital became Moulmein, and Tenasserim Division's became Tavoy. In addition, Rakhine Division was granted statehood.
In 1989, after the coup d'état by the military junta, the names of many divisions in Burma were altered in English to reflect Burmese pronunciations.
After 1995, in Kachin State Mohnyin District was created out of Myitkyina District as part of the peace agreement with the Kachin Independence Army.
Read more about this topic: Subdivisions Of Burma, History