Dadra and Nagar Haveli is a region in western India. It is composed of two separate geographical entities: Nagar Haveli, wedged between Maharashtra and Gujarat and 1 km to the northwest, the smaller enclave of Dadra, which is surrounded by Gujarat. Silvassa is the administrative headquarters of Dadra and Nagar Haveli. Unlike the surrounding areas, Dadra and Nagar Haveli was ruled by the Portuguese from 1783 until the mid-20th century. The area was captured by Pro-India forces in 1954 and administered as the de-facto state of Free Dadra and Nagar Haveli before being annexed to India as a union territory, the Union Territory of Dadra and Nagar Haveli in 1961. The union territory was merged with the neighbouring union territory of Daman and Diu to form the new union territory of Dadra and Nagar Haveli and Daman and Diu on January 26, 2020. The territory of Dadra and Nagar Haveli then became one of the three districts of the new union territory, as the Dadra and Nagar Haveli District.
In 1961, amidst Indian preparation for the invasion of Goa, Daman, and Diu, K.G. Badlani, an officer of the Indian Administrative Service was, for one day, designated the Prime Minister of Dadra and Nagar Haveli, so that, as Head of State, he could sign an agreement with the Prime Minister of India, Jawaharlal Nehru, and formally merge Dadra and Nagar Haveli with the Republic of India. The Tenth Amendment of the Constitution of India was passed to incorporate Dadra and Nagar Haveli as a union territory, effective 11 August 1961.
On 31 December 1974 a treaty was signed between India and Portugal on recognition of India's sovereignty over Goa, Daman, Diu, Dadra and Nagar Haveli.
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