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Undivided Assam refers to the then undivided greater state of Assam in India soon after the Indian Independence in 1947 till 1963. In addition to the present-day Assam, it included the current states of Arunachal Pradesh, Meghalaya, Nagaland and Mizoram. The capital of this state was Shillong, currently the capital of Meghalaya. 
|Dec 1, 1963||Nagaland|
|Apr 2, 1970||Meghalaya|
|Jan 21, 1972||Mizoram|
|Jan 21, 1972||Arunachal Pradesh|
- "Assam Gazzeter: Geology". Government of Assam. p. 33.
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