Disease, hard labor, starvation and violent confrontation are all possible and most likely
In late March 1857 a sepoy named Mangal Pandey attacked British officers at the military garrison in Barrackpore. He was arrested and then executed by the British in early April. Later in April sepoy troopers at Meerut refused the Enfield cartridges, and, as punishment, they were given long prison terms, fettered, and put in jail. This punishment incensed their comrades, who rose on May 10, shot their British officers, and marched to Delhi, where there were no European troops. There the local sepoy garrison joined the Meerut men, and by nightfall the aged pensionary Mughal emperor Bahādur Shah II had been nominally restored to power by a tumultuous soldiery. The seizure of Delhi provided a focus and set the pattern for the whole mutiny, which then spread throughout northern India. With the exception of the Mughal emperor and his sons and Nana Sahib, the adopted son of the deposed Maratha peshwa, none of the important Indian princes joined the mutineers.
---prejudice----
here is the definition of discrimination:
the unjust or prejudicial treatment of different categories of people or things, especially on the grounds of race, age, or sex.
Answer: a treaty between two or more countries to make trade easier and to destroy trade barriers