អូឌីយ៉ូ​ដែល​បាន​ចែករំលែក

"Why did the Indo-Aryans migrate? It was a combination of factors: the power of iron tools to conquer the wilderness, the drying up of the Saraswati River, and a natural shift toward settled farming in the rain-rich Gangetic plains. As tribes grew, they needed more territory, leading to the rise of organized kingdoms called Janapadas."