It is important to include the Iranian version of the story of Alexander the Great as written in the Shahnameh by Firdowsi. Yes it is different, but it answers a lot of questions that Greek and Western historians cannot answer.
1. Why was it so easy to invade Iran? It was not easy, he was recognised by the Iranian Generals as he looked like his Iranian father. 2. Why did he not return to Greece. Because he had an affinity for his Iranian side.
What Alexander did do was to unite the world of the time and create a new world order from a new city on the eastern front of Iran.
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