The following points may help you:
a. Rise of industrialisation , development of cotton industries in England brought a dramatic change in the British commercial policy.
b. The India cotton industry and textiles which for centuries had made India's name a byword in the World and in England was severely affected.
c. Fear of competition from the Indian cotton, compelled cotton manufactures in Manchester to impose import duties on textiles coming from India, that would enable them to sell their goods without any competition.
d. The East India Company, after industrial process, was no longer interested in buying Indian manufactured goods, rather looked for market for its own goods. This increased export of British cotton goods to India on a large scale.
e. As British cotton goods, were exported in India, the Indian cotton weavers faced fierce competition from the British cheap and machine made goods.
f. . During the American civil war, cotton supplies from US were effected.
g. The British further compelled India, to supply raw materials to serve their cotton industries , creating shortage for raw cotton for native weavers, who were forced to buy it at high price, this further impacted their meagre earnings, forcing them to shift their occupation and become agricultural labourers.