Not really it was during the British period. Bengali settlement started after the failed invasion of Bakhtiar Khilji in 1205. He lost the battle but it paved the way for our people in Rangpur and Mymensingh to go, occupy a few patches of land for cultivation and settle in the western Assam although sovereignty lied with the King of Assam.Why not merge Assam with Bangladesh. Everyone knows that villages and town of Assam have full of Bangladeshi people. This makes Assam a natural Bangladeshi territory. At the time of British rule British allows Bangalis to migrate and settle in Assam that's why Assam have so many Bangalis living there. In near future Indian will lose Assam to Bangladeshi people.
It was something like a person has four sons, one or two would finally settle in Assam and the other two would remain in their native Bengal. Assam was not dense with population, even Bengal was not that populated but there are other events afterward including those in the British time to cause a slow migration of Bengali Muslims to western Assam.
And now the Indian brats in PDF say they are Bangladeshis. Very illiterate and stupid guys without a trace of knowledge in history. Always blabbering with an evil mind.
No, the illegal Bangladeshis are those 1.1 million people who board Moitree Express trains to go to a country called poor India and decide to stay in the Bombay and other slums scattered all over it. However, I do not know exactly why your govt should give them a red carpet welcome at the border? Oh!! Is it because your poor country gets a lot of dollar money from them?Bangladeshis are those illegals that pole vault over the barbed fence to gain entry to India and we will do everything in our might to send them packing.