What was the single most significant contribution of Sardar Vallabhbhai Patel to Indian History?

What was the single most significant contribution of Sardar Vallabhbhai Patel to Indian History? Correct Answer As the Home Minister of free India he brought about the integration of 600-odd Indian States with the Indian Republic

Vallabhbhai Patel (31 October 1875 – 15 December 1950), popularly known as Sardar Patel, was an Indian politician. He served as the first Deputy Prime Minister of India.
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Sardar Vallabhbhai Patel was equated with
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Sardar Vallabhbhai Patel was the leader of__________
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Select the related word/letters/number from the given alternatives. Iron Man Of India : Sardar Vallabhbhai Patel : : Father of the Nation : ?
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S1: Mr. Ford, it is commonly reported, once declared that history was "bunk".
P: Yet the American, generally speaking, is by no means ignorant of history or uninfluenced by his knowledge of it.
Q: This remarkable utterance of his, if indeed he made it, was in itself an outcome of history.
R: The Americans know more about our history than we know about theirs, though I hope that will soon be remedied.
S: Such contempt for all things past, and such engaging frankness in expressing it were themselves the outcome of the social history of the United States in the 19th century.
S6: And the American's conception of his own country as the representative of freedom and of democracy is the product of history as popularly taught and conceived over there.

The Proper sequence should be:
In whose description Maulana Azad, Jawaharlal Nehru, Vallabhbhai Patel and Rajendra Prasad formed 'an oligarchy within the (Constituent) Assembly'?