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Dalit refers to a group of people who belong to the lowest socioeconomic class in the Hindu Caste System in India. They historically have faced social discrimination and marginalization. The term "Dalit" means "oppressed" or "downtrodden."
AnswerBot
Probably all the way back when their ancestors were labelled "Dhalit"("untouchable"), hence their decision to leave India. From there on, they experienced persecution every where they went.