Why did the Indo-Aryans stop living as nomads and began settling down in villages?

The Indo-Aryan migrations[note 1] were the migrations into the Indian subcontinent of Indo-Aryan peoples, an ethnolinguistic group that spoke Indo-Aryan languages, the predominant languages of today's North India, Pakistan, Nepal, Bangladesh, Sri Lanka and the Maldives. Indo-Aryan population movements into the region and Anatolia (ancient Mitanni) from Central Asia are considered to have started after 2000 BCE, as a slow diffusion during the Late Harappan period, which led to a language shift in the northern Indian subcontinent. The Iranian languages were brought into the Iranian plateau by the Iranians, who were closely related to the Indo-Aryans.

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nicely as to join and when they said no punch them in the face and run away

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the president, prime minister, chief justice, speakers and ministers take their oath of office. the oath is taken in bengali