It's becasue human populations are concentrated in areas that are lacking proper resources.
Answer:
Aryans moved from the area of todays Afghanistan to the Indian subcontinent during the period of Indo-Aryan migration, somewhere around 1800 and 1500 BC.
Explanation:
Some scholars don't agree with this theory that the Aryans migrated to the Indian subcontinent, but most of historians are arguing that during this migration they came from the North and destroyed the Dravidians who were living there. Their period that started during the migration is known as Vedic period.
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