How were the princely states integrated into Indian Union with the efforts of Sardar Vallabbhai Patel?

1) Sardar patel took charge of the state’s department in July 1947. He sensed the urgent and imperative need of the integration of princely states. He made it clear that he did not recognize the right of any state to remain independent and in isolation within India.

2) He handled the Junagarh and Hyderabad crisis as a seasoned states man.

3) Patel also appealed to the patriotic and national sentiments of the Princes and invited them to join the forming of a democratic constitution in the national interest the persuaded them to surrender defence, foreign affairs and communication to the Government of India.