 
 <prompt> Wetin dem name after the Rigvedas? Based on di last question, write one context wey contain di answer. E fit be 1 - 20 sentences. Context: <response>: At di end of di Rigvedic period, di Aryan society begin dey expand from di northwestern region of di Indian subcontinent, enta di western Ganges plain. E begin dey do more farming and dem organise dem society around di hierarchy of di four varnas, or social classes. Dis social structure dey show say dem dey mix with di native cultures of northern India, but later dem begin dey exclude indigenous people by calling their work dirty. During dis time, many of di small tribal units and chiefdoms begin dey come together to form monarchical, state-level governments. 