The Khilafat movement and the Non-Cooperation movement were indeed significant mass movements that emerged in India between 1919 and 1922, both aimed at opposing British rule.
Montagu’s Statement of August 1917, also referred to as the August Declaration of 1917, was a speech given by Edwin Samuel Montagu, the secretary of state for India, in the British House of Commons on August 20, 1917.
The Surat Split of 1907 partitioned the Indian National Congress into moderates and extremists, marking a significant ideological and political division.
The annulment of the partition of Bengal in 1911 was a significant development in response to various factors, including the resistance to the partition, the emergence of revolutionary terrorism, and political considerations.