Explanation:

India prepared a constitution for Sikkim that was approved by its national assembly in 1974. In a special referendum held in 1975, more than 97 percent of the electorate voted for the merger of Sikkim with India. Sikkim became the 22nd state of India on May 16, 1975.

However, they could not fulfil the aspirations of the Goan people and ultimately on 19 December 1961, Goa was liberated and made a composite union territory with Daman and Diu. On 30 May 1987 Goa was conferred statehood and Daman and Diu was made a separate union territory.

Maharashtra was formed on 1 May 1960 by splitting the bilingual Bombay State, which had existed since 1956, into majority Marathi-speaking Maharashtra and Gujarati-speaking Gujarat, respectively. The state capital is Mumbai, the most populous urban area in India.

Nagaland became the 16th state of India on 1 December 1963.