Explanation: In 1757, after the Battle of Plassey, the British laid the first step towards getting power in northern India.

• And in 1857 took place the major ‘Revolt’ which was a product of the character and policies of colonial rule after 1757, and after which noteworthy changes took place in the British policy of ruling over India.
• The cumulative effect of British expansionist policies, economic exploitation and administrative innovations over the years had adversely affected the positions of all—rulers of Indian states, sepoys, zamindars, peasants, traders, artisans, pundits, maulvis, etc.
• The simmering discontent burst in the form of a violent storm in 1857 which shook the British Empire in India to its very foundations.

Source: Spectrum Modern India