As we all know,Anatolia and Caucasus have a very credible role in the making of the Modern World Civilization though today. These people were mainly Urban to Semi Urban. In this timeline we would have groups of Non Indo-European people like those who resided in Anatolia and Caucasus like the Hattians,Kaskians,Hurrians,Urartians,Caucasian Albanians, Circassians,etc,who primarily originated in the Caucasus and predate the Indo-Europeans and lived in Bronze age cities as it seems to populate regions of Iran's river basins and establishing some strong Civilizations there before entering India in good number and saving the IVC from collapse and take it over,establishing and settling in more urban megapoles across the Sindh and Punjab region and good and advanced empires. IVC language and religion survives as an appropriated form. So do most of the Pre-Indo-Iranian cultures in these regions and now taken over by these people. Indo-Iranians(Iranians and the Aryans) come in. These are mostly Rural Pastoral people without exposure to Urbanization. They first join these empires as peasents and through stability and relative prosperity,increase in number and eventually rise to prominent positions in the Empire. So now you have a culturally/ethnically continious and a more prosperous and urbanized Iran,India,Afghanistan and Eastern Anatolia. How would this take shape later and how would various events that affected the World later take hold?