I'd say the telephone. The telephone is the most electronic device used to people. It let people talk over long distances. It evolved over time into (abbreviated form) things like samsung galaxy phones, text now phones, and flip phones and more!
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To go in world peace? Idk
The caste system is a system that divides Hindus into four main categories - Brahmins, Kshatriyas, Vaishyas and the Shudras. Sorta like a pyramid of food groups in health. These castes were based on peoples daily jobs/occupations. Outside of the caste system there were the untouchables or otherwise known as the "the Dalits".
Hope I could help! :)
