Indian civilisation starts with sindu-saraswati civilisation of which indus valley is just a part.This civilization was spread from present day pakistan nort west fortier till the vast ganges plain,including the plains of saraswati. Now this saraswati which got disappered from face of the earth once flow in haryana , rajasthan and gurajat kuch making rajasthan and guraj kuch a desert since they were no other mighty river in this part of india.Now there are many proofs that rajasthan was once a everygreen thick forest as many elephant fossiles have being found there and also the the satellite mapping have shown the presence of a very mighty river in th desert.On we all in India know that we have myth that their was one mighty river called saraswati which disappeared and forced migration of many people to migrate to many parts of india.The people who migrated from the basin of sraswati river call themself as saraswats ,they are many different groups of saraswat people who are spread all across india including kashmir,goa,kerala,karnataka,maharastra,bengal. It would be great help if you could do some wiki on saraswat people.Ramayan was not written by a brahmin,neither tuslidas was a brahmin nor was kalidas a brahmin who wrote the whole ancestory of Raam called raghu vamshi.
