A cikin shekarun 1960, jihar Assam da ke arewa maso gabashin Indiya ta yi wani gagarumin gyare-gyare domin kafa sabbin jahohi da dama, tare da amincewa da bambancin kabilanci da al'adu na yankin.An fara tsarin ne a cikin 1963 tare da ƙirƙirar Nagaland, wanda aka zana daga gundumar Naga Hills na Assam da wasu sassan Tuensang, ya zama jiha ta 16 a Indiya.Wannan matakin ya gane asalin al'adun mutanen Naga na musamman.Bayan haka, buƙatun mutanen Khasi, Jaintia, da Garo sun haifar da kafa ƙasa mai cin gashin kanta a cikin Assam a cikin 1970, wanda ya ƙunshi tsaunin Khasi, Jaintia, da Garo Hills.A shekara ta 1972, wannan yanki mai cin gashin kansa ya sami cikakken matsayin jiha, ya zama Meghalaya.A wannan shekarar, Arunachal Pradesh, wanda a da ake kira North-East Frontier Agency, da Mizoram, wanda ya hada da tsaunin Mizo a kudu, an raba su da Assam a matsayin yankunan kungiyar.A cikin 1986, waɗannan yankuna biyu sun sami cikakkiyar ƙasa.^[44]