On September 21, 1949, the Maharajah was forced to sign a merger agreement with the Union of Indians, which was due to come into force on October 15 of the same year.  As a result of the agreement, Manipur State merged with the Indian Union as a Part C state (similar to a high-level province under colonial rule, later called Union Territory) to be led by a senior commissioner appointed by the Indian government. The representative assembly of Manipur has been abolished.  Maharaja Bodhachandra Singh of Manipur and V.P. Menon, representing the UNION government, signed the Manipur merger agreement on 15 October 1949. The merger of Tripura was signed by Maharani Kanchanprabha Devi, who had been in charge of the state since the death of her husband and the last current king Maharaja Bir Bikram Kishore Manikya in 1947. The accession of the State of Manipur to India has taken on the character of an international treaty between two sovereign states. Such a treaty is proof that in September 1949, the State of Manipur was a sovereign state and never a vassal or protectorate state. Under international law, membership is the transfer of sovereignty over the national territory by the owner state to another state through a bilateral agreement or treaty.
Parts of Manipur closed on Tuesday against the state`s merger with the Indian Union 70 years ago. The reaction to a bandh for the same reason in Tripura was lukewarm. Two extremist affiliates based in Manipur – the Coordinating Committee (CorCom) and the Alliance of Socialist Unity, Kangleipak (ASUK) – and the Tripura-based National Liberation Front Twipra (NLFT) announced the closure to mark the „forced merger“ of the two states with India on 15 October 1949. His Highness of the Maharajah will have the right, with effect of the day mentioned, to obtain for his life revenues from the state annually for his Privy Purse the sum of three lakhs free of all taxes. This amount is intended to cover all expenses of the sovereign and his family, including expenses relating to his personal personnel and armed guards, the maintenance of his residences, marriages and other ceremonies, etc., and compensation for the sovereign`s relations which, on the day of the implementation of this agreement, received such compensation from state revenues. and for some reason it is neither increased nor reduced. The Indian government agrees to pay the aforementioned sum of three lakhs to His Highness, the Maharajah, in four instalments at the beginning of each quarter from the public treasury or to another treasury, which may be fixed by the Indian government. „The merger agreements were signed under the coercion of two incompetent authorities from both kingdoms,“ he said in the joint statement of the extremist groups.