One of the biggest problems with what has been posted by
@vsdoc is that OIT is what happened and not AIT. A river dries up down the source and not up the source. Same is true about population migration. if we believe ANI and ASI theory, we find that ASI have remained in large numbers within their native place while ANI has mixing. Does this not support OIT. How is it that people who came to India some 4k years back have disappeared completely or changed to a different group? How is that possible? The new worlds like US, NZ & Aus very inhabited by people from Europe and Europe still has sizeable population of the original settlers. Where are those Aryands who came to India and created ANI.
The story goes much farther back than 4k years. It goes back to 12-15k years. The first exodus out of Brahmvasha took place after the war between the grandson of Dhadhichi and Lord Varuna. This resulted in such damage that part of Btahmvarsha was made inhospitable for human beings. It was then that the Pushkar lake was formed to remove the radiation fallout of the weapons used in that war. The waters of Pushkar lake are the waters of saraswati river. Even Sambhar lake was fed by Saraswati. It was during the exodus out of brahmvarsha that people went to west to Iran and east towards Gangetic plains. My Gotra roots migrated in the first exodus to Gangetic plains and that is why Righi Bhardwaj made his Ashram at Prayagraj. The second exodus happened after another 3-4k years and this is the time of the great flood/deluge. The last happened during the times of Lord Parshurama when he decided to kill every Kshatriya above the age of 16.
India became BharatVarsha after that exodus. The people who inhabited Indus valley were the same people who migrated from Saraswati river due to the intense radiations from those wars. Can anyone explain to me why we have a desert between two major rivers? Has it happened anywhr wlse on earth? Why is is peculier to Rajasthan only?
The land was rendered unfurtile and bareft of any vegetation due to nuke radiation.