Most of the kings feared that after independence either their people would plunder their properties or the Indian government would confiscated them. The British power could not protect the Indian kings in any way after independence. Most of them began to understand that either in a very disrespectful way to be erased forever or to somehow preserve some of their property and some of their rights in a respectable way.
On 31 July 1947, King Sadul Singh of Bikaner wrote a letter to the secretary of the princely ministry, demanding privileges. The secretary of the princely ministry wrote to the Maharaja that we have consulted all the concerned departments of the central government regarding the personal privileges of the kings and I have been directed to assure that the privileges enjoyed by the kings and their families are the same. Will continue to do so in future also. Bikaner Maharaja sent copies of this letter to many kings. The Jodhpur Maharaja was not convinced by this letter, but he did not demand any special rights from the central government.
The velvet gloved hands of Sardar Patel began to tighten on the arms of the kings. The liberal appeal of Sardar Patel, the speech given by Mountbatten to the Narendra Mandal, the departure of the corefield, the people's movement going on in the princely states and the princely ministry's letter to the king of Bikaner, etc. Gave it. King Sadul Singh of Bikaner was the first king to sign.
Most of the states, especially the smaller states, which knew their boundaries and also knew which side of the bread was buttered, voluntarily came under the Indian Union. They were neither financially capable nor did they have the ability to resist internal or external pressures.
Many intelligent and realistic kings realized the futility of opposition and the significance of membership of the Constituent Assembly of the mighty Union of India and graciously joined the Union of India. Some were jovial and witty in nature, they were also pushed into the Sangh. Some kings were scared of their scams and exploits, they were also forced into the union.