Originally posted by: vyapti
I know that.
I was just telling that your comparison actually has some truth in it. The possible reason is---India is safeguarded from all sides through sea and mountains, so Khyber pass is one of the main entry points.
Yes actually there were chances of intermingling more in the areas of khyber pass so they were always Adharmi in eyes of Central Indians
But I doubt there were many invasions by the time of Mahabharat (that is post Aryans that is) it had more to do with intermingling
The reasons why I think those areas were different in culture could be
1) Those areas had direct trade with Mesopotamia and Central Asia as we know (The trade was there during IVC times and even post that the we have found traces of Indian spices in Middle Eastern countries) and thereby there was a tinge of ME influence onto them which was a complete no no for Central Indians
2) As I said earlier they were closer to Iran and their area (Hapta Hindu- our Sapta Sindhu) was like a pilgrimage site for Ahura worshippers. I think despite their religious differences they would have been allowed by the rulers in certain occasions. The proximity with the arch rivals made them slightly like them. (Like Pakistani Muslims although dislike every culture of Indian origin still have functions like Mehandi and Haldi in the marriages which are the traditions of this land) making their practices Asuri for the more traditional Indians
3) If for once we don't consider AIT/AMT and go with Out Of India Theory, then it is more clear. The people of these areas were different tribe of RigVeda arguably Anus and Dhuryasus who were forced westward from Ravi Parsuni(Ravi) by Sudasa. Even Mahabharat which gives all tribes a common ancestry through Yayati mentions the children of Anu taking up these lands, Baudhadhayan Sutra states the same too
They were actually the proto Zoroastrians or I might say few of their community went further ahead to become Zoroastrian Iranis while these though remained in Dharmik fold had definitely more in common with their developmental cousins Zoroastrians (Ahur worshippers) than their neighbors RigVedics
4) They were matrilinear society and more freedom to women something which definitely different from Central Indian mindset
These are my opinions but could be different too