The people of the Mongoloid race of the North East, while retaining their racial identity, did not fight shy of dissolving themselves in the Hinduish mainstream of life. In the Epics of Ramayana and Mahabharata the North Eastern belt is mentioned by the names of Kamrup. Pragjyotisha etc. The bodos, kacharis, rabhas, choodiyas, morans, duris, moshings and other tribals of these areas and speaking the languages of the Tibeto-Burman family, have by and large became a part of the Hindu society. The people of Assam, belonging to the bodo, kachari and rabha sects assumed a new name for their group – the Rajbanshis. An important sect called the ahoms belonging to the shans or thais were those who reached Myanmar from Yunan of China and form there to Assam. They also became absorbed as Hindus. The other shans like khamyangs, khamthis, thurankgs, eithons, fakkiyan also migrated to Assam and got assimilated in the body of Hinduism.
The Maiteyis of Manipur are Hindus, but they are the descendants of the Tartars who migrated from China in the 13-14th centuries. In the state of Tripura, you can see a cultural atmosphere in which the Hindus and the Tribal religion co-exist The Hindus of this state worship the gods of Haran (Shiva), Uma (Parvati), Hari (Vishnu), Lakshmi, Saraswati, Brahma, Pritvi (bhumi), Samudra (the sea), Gamga (the River ganges), agni (fire), Kama, Himalaya and so on. The worship of Brahma, the god of creation, is very rare elsewhere. The priests in Tripura are not brahmans but the tripuris, the tribals of the area.