The correct answer is Mewar. The state of Mewar of Rajputana joined in the third phase of the integration of Rajasthan. Rajasthan was formerly known as Rajputana. The process of integration of Rajasthan in the united Rajasthan was completed in 7 phases. The State of Mewar (Udaipur) got united in Rajasthan Union on 18th April 1948. Rajasthan is one of the 28 states of the Indian union. Rajasthan came into existence on 30th March 1949 and since 30th March celebrated as Rajasthan day. Additional InformationPhaseName of GroupStates1Matsya UnionAlwar, Bharatpur, Dholpur, Karauli. 2Rajasthan UnionBanswara, Bundi, Dungerpur, Jhalawar, Kishangarh, Kota, Pratapgarh, Shahpura, Tonk. 3United State of RajasthanUdaipur (Mewar) joined with the other Union of Rajasthan. 4Greater RajasthanBikaner, Jaipur, Jaisalmer & Jodhpur joined with the United State of Rajasthan. 5United State of Greater RajasthanMatsya Union merged in Greater Rajasthan. 6United Rajasthan18 States of United Rajasthan merged with Princely State Sirohi except for Abu and Delwara. 7Re-organised RajasthanUnder the State Re-organisation Act, 1956 the erstwhile part ‚¬ËœC‚¬„¢ State of Ajmer, Abu Road Taluka, a former part of princely State Sirohi which was merged in former Bombay State, and Sunel Tappa region of the former Madhya Bharat merged with Rajasthan and Sironj subdistrict of Jhalawar district was transferred to Madhya Pradesh.