The correct answer is Indigo cultivation.
Bettiah Raj was a princely state in India that existed from the 16th century to 1947. It was located in the present-day state of Bihar. The state was known for its large estates involved in indigo cultivation. Indigo is a plant that is used to make a blue dye. It was a major cash crop in India during the colonial period. The British East India Company forced Indian peasants to grow indigo on their land, and the indigo planters often used violence and intimidation to extract a high price for the crop. The indigo plantations were a major source of revenue for the Bettiah Raj, and the state’s rulers were closely involved in the management of the plantations.
Sugarcane production, rice cultivation, and textile production were also important industries in Bettiah Raj, but they were not as significant as indigo cultivation. Sugarcane was grown in the state’s southern districts, and rice was grown in the northern districts. Textile production was concentrated in the towns of Bettiah and Motihari.
The Bettiah Raj was a major power in the region, and its rulers played an important role in the history of India. The state was abolished in 1947, after the independence of India.