Solution:Lord Wellesley (1798-1805) cleverly used a subsidiary alliance as a tool to make Indian provinces puppets of Britishers. He did not discover this method. This method was in practice earlier also but it gradually evolved and the final shape was provided by Wellesly.Dupleix was the first European to give his army to an Indian ruler on the promise of a fixed payment to the Company. Britishers used these tactics too. First Subsidiary Alliance was signed in 1765 with Awadh on a fixed payment to the Company promised to protect the boundaries of Awadh on a fixed payment to the Company.
The evolved version of the Subsidiary Alliance was accepted by the Princely States in the following Sequence Hyderabad (1798 and 1800), Mysore (1799), Tanjore (1799), Oudh(1801),Peshwa (1802), Bhonsle of Barar (1803), Sindhiya (1804), Holkar (1818), Jodhpur, Jaipur, Machheri, Bundi and Bharatpur.
Note: Hyderabad will be the answer if it was asked first state to join Wellesley's subsidiary alliance.