The partition of India in 1947 was largely an attempt to quell sectarian violence in the country by splitting it into a majority Hindu India and a majority Muslim Pakistan. 
the main leaders were
All India Muslim League Indian National Congress Lord Mountbatten Sir Cyril Radcliffe Mohammed Ali Jinnah Jawaharlal Nehru Gandhi
In 1940 A.D. in Lahore Sessions, the Muslims first of all placed their demand for Pakistan in very clear and main words and proposed to make a Muslim state by uniting the northwest and the eastern region.In 1941 A.D. of the time of the Madras Session Muhammad Alijinnah put forth the demand that the aim of the Muslim League was to establish an independent state in the north western and easterns provinces.