Why is Buddhism Widespread in India?

because Buddhism did not approve of caste division. Buddha preached the equality of all people, mercy, compassion. He argued that any person, following the right path, can reach an enlightened state.

Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.