 Although the precise origins of the Naga people is difficult to determine, it is generally believed by historians that the Naga settlement happened over a period of time in waves as various Naga tribes from China and elsewhere entered the uninhabited Naga Hills through Burma.Additionally, as various different Naga communities settled into Nagaland, Nagaland became inhabited by over twenty indigenous Naga groups, as well as several other immigrant groups, all of whom spoke mutually unintelligible languages.Despite groups generally remaining in isolation from one another, a way for inter-group communication between the Naga Hills tribes as well as the non-Naga Assamese indigenous people, who lived in the plains and included groups such as the Kachan, Ahom, and Manipuri people, was necessary.