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

He was the leading light of Mahatma Gandhi's NonCooperation and Civil Disobedience Movements
He was responsible for the acceptance of the Mountbatten Plan by the Congress
As President of the Indian National Congress he engineered the passing of the Quit India Resolution
As the Home Minister of free India he brought about the integration of 600-odd Indian States with the Indian Republic

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Modern Indian History
The Lucknow Session of INC and the Lucknow Pact (1916) were significant on account of

Both (a) and (b) above
unity between the Moderates and the Extremists with the return of the Extremists to the Congress
the pact between the Congress and Muslim League
the beginning of the tide of Indian Nationalism

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