In 1947 India had Mysore, Punjab, Madras, Bombay, Orissa, Bengal, United Provinces, Central Provinces, Assam, Rajasthan and J&K as states. Andaman and Nicobar Islands, Delhi, Laccadive, Minicoy and Amindivi Islands were the Union Territories.
The States Reorganization Act, 1956, divided Kerala from Mysore state, Andhra Pradesh from Madras State, Himachal Pradesh as a Union Territory from Punjab and Tripura and Manipur as a Union Territory from Assam. It also gave Delhi its current recognition of Union Territory.
After that, States had always been dividing. In 1960, Gujarat was divided from Bombay state. In 1962, Pondicherry was liberated from French capture and in 1963, it was renamed as Puducherry, with its recognition as Union Territory. Goa, Daman and Diu and Dadra and Nagar Haveli liberated from Portuguese rule in 1961. Dadra and Nagar Haveli was given a recognition of union territory in 1961 only. Goa and Daman and Diu were together a Uniom Territory, but in 1987, Daman and Diu was again divided from Goa and given a recognition of union territory only, whereas Goa was given a recognition of state. Haryana was divided from Punjab in 1966. Himachal Pradesh was given a recognition of a state in 1971 with some parts of Punjab being merged into the new state of Himachal Pradesh. Bengal was renamed as West Bengal when Bangladesh separated from Pakistan in 1971. Bombay was renamed as Maharashtra, United provinces was renamed as Uttar Pradesh and Central provinces was renamed as Madhya Pradesh. Also, 3 states, currently known as Nagaland, Meghalaya and Mizoram were divided from Assam, starting from 1964 to 1971. At this time, Tripura and Manipur were also given a separate recognition as states. Mysore was renamed as Karnataka in 1973. Laccadive, Minicoy and Amindivi Islands were also renamed as Lakshadweep Islands in 1973. Sikkim, which was another territory apart from India, chose India's democracy and got into India as a state in 1975. Arunachal Pradesh was again separated from Assam in 1987. Then in 2000, Chhattisgarh was divided from Madhya Pradesh, Jharkhand was divided from Bihar and Uttarakhand was divided from Uttar Pradesh. Then the newest state of all, Telangana, was divided from Andhra Pradesh in 2014. Now, in 2019, J&K was divided in two Union Territoteries namely Jammu and Kashmir and Ladakh.
And at the recent in the starting of 2020, an official merger merged the two small union territories of Daman & Diu and Dadra & Nagar Haveli into a single union territory of Daman and Diu and Dadra and Nagar Haveli. This, at recent, makes India a fraternal unit of 28 states and 8 union territories.
I think it was a good decision to create these states on the basis of languages. This is the beauty of our country that despite being different we are United as a single state.
Be indian and buy Indian.