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The Aryan political structure changed from the rajas who ruled with a council to kingdoms ruled by regional chiefs as a result ofResponsestheir interaction with the larger Dravidian cities.their interaction with the larger Dravidian cities.the Aryans settling into permanent agricultural communities.the Aryans settling into permanent agricultural communities.the strict social restrictions of the caste system.the strict social restrictions of the caste system.the need for protection from nomadic invasions.the need for protection from nomadic invasions.the threat of nomadic invasions from northem Asia.

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