What was the main reason for the split in the Indian National Congress at Surat in 1907?
The Extremist wanted to extend the Boycott and Swadeshi Movement to regions outside Bengal and also include all forms of associations (government services, law courts, councils, etc.) within the boycott programme, thus starting a nationwide mass movement. Unlike Extremists, Moderates were opposed to extending the movement and the idea of passive resistance. They felt that it involved the use of force. After the split, the Congress came to be dominated by the Moderates with Tilak?s followers functioning from outside. The two groups reunited in December 1915. Next year, the Congress and the Muslim League signed the Lucknow Pact and decided to work together for representative government in the country.