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How did Dadra and Nagar Haveli merge with Daman and Diu in 2020?

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In January 2020, the union territories of Dadra and Nagar Haveli and Daman and Diu were combined into a single administrative unit known as Dadra and Nagar Haveli and Daman and Diu.12

Under the Constitution of India, the union government holds the authority to create, dissolve, or combine union territory administrative units. This merger consolidated the three noncontiguous districts—Dadra and Nagar Haveli, Daman, and Diu—which share a common history of Portuguese rule prior to their integration into India. The new, unified territory is overseen by an administrator appointed by the central Indian government.21