The 1857 revolt was a major uprising against British rule in India that involved many disgruntled groups. It was sparked by both long-standing political, economic, social and religious grievances as well as more immediate triggers. Key causes included the annexation of states, the doctrine of lapse, high taxation, loss of jobs and status for Indians, introduction of new firearms, and activities of Christian missionaries. The revolt began with mutiny by sepoys in Meerut and spread to Delhi and other regions, but lacked strong centralized leadership and coordination. It was eventually suppressed by the British through superior weapons and communication, though it highlighted weaknesses in colonial control and had important impacts like transferring power to the British government.