Answer:
One of the most important natural resources that India supplied to Britain in the 19th century was cotton. India was a major producer of cotton, which was in high demand in Britain's rapidly expanding textile industry. The British East India Company began exporting Indian cotton to Britain in large quantities in the late 18th century, and by the mid-19th century, India had become Britain's largest supplier of cotton. However, the trade was heavily controlled by the British, and Indian cotton producers received very low prices for their crops, which contributed to widespread poverty and suffering in India.