Chronological Chart for the historical periods of Afghanistan
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مجيء الإيرانيين
c.1700-1100 BC: The Rigveda, one of the oldest known texts written in an Indo-European language, is composed in a region described as Sapta Sindhu ('land of seven great rivers', which may correspond to the Kabul Valley).
c. 1350 BC: Migration of waves of Iranian tribes begin from the Bactria–Margiana Archaeological Complex westwards to the Iranian plateau, western Afghanistan and western Iran. According to the Avesta (Vendidad 1.1-21), they are compelled to leave their homeland Airyana Vaēǰah because Aŋra Mainyu so altered the climate that the winter became ten months long and the summer only two. Along the way, they settle down near large rivers, such as Bāxδī, Harōiva, Haraxᵛaitī, etc. (See Avestan geography.)
c. 1100-550 BC: Zoroaster introduces a new religion at Bactra (Present-day Balkh) - Zoroastrianism - which spreads across Iranian plateau. He composes Older (i.e. 'Gathic') Avesta and later Younger Avesta is composed - at least - in Sīstān/Arachosia, Herāt, Merv and Bactria.