The government of India, which has the unilateral powers to change the borders of a state, divided Assam into several states beginning in 1970 within the borders of what was then Assam.
In 1963, the Naga Hills district became the 16th state of India under the name of Nagaland.
Part of Tuensang was added to Nagaland.
In 1970, in response to the demands of the Khasi, Jaintia and Garo people of the Meghalaya Plateau, the districts containing the Khasi Hills, Jaintia Hills, and Garo Hills were formed into an autonomous state within Assam; in 1972 this became a separate state under the name of Meghalaya.
In 1972, Arunachal Pradesh (the North East Frontier Agency) and Mizoram (from the Mizo Hills in the south) were separated from Assam as union territories; both became states in 1986.

Since the restructuring of Assam after independence, communal tensions and violence remain.
Separatist groups began forming along ethnic lines, and demands for autonomy and sovereignty grew, resulting in the fragmentation of Assam.
In 1961, the government of Assam passed legislation making use of the Assamese language compulsory.
It was withdrawn later under pressure from Bengali speaking people in Cachar.
In the 1980s the Brahmaputra valley saw a six-year Assam Agitation triggered by the discovery of a sudden rise in registered voters on electoral rolls.
It tried to force the government to identify and deport foreigners illegally migrating from neighbouring Bangladesh and to provide constitutional, legislative, administrative and cultural safeguards for the indigenous Assamese majority, which they felt was under threat due to the increase of migration from Bangladesh.
The agitation ended after an accord (Assam Accord 1985) between its leaders and the Union Government, which remained unimplemented, causing simmering discontent.

The post 1970s experienced the growth of armed separatist groups such as the United Liberation Front of Asom (ULFA) and the National Democratic Front of Bodoland (NDFB).
In November 1990, the Government of India deployed the Indian army, after which low-intensity military conflicts and political homicides have been continuing for more than a decade.
In recent times, ethnically based militant groups have grown.
Panchayati Raj Institutions have been applied in Assam, after agitation of the communities due to the sluggish rate of development and general apathy of successive state governments towards Indigenous Assamese communities.
The government of India, which has the unilateral powers to change the borders of a state, divided Assam into several states beginning in 1970 within the borders of what was then Assam. In 1963, the Naga Hills district became the 16th state of India under the name of Nagaland. Part of Tuensang was added to Nagaland. In 1970, in response to the demands of the Khasi, Jaintia and Garo people of the Meghalaya Plateau, the districts containing the Khasi Hills, Jaintia Hills, and Garo Hills were formed into an autonomous state within Assam; in 1972 this became a separate state under the name of Meghalaya. In 1972, Arunachal Pradesh (the North East Frontier Agency) and Mizoram (from the Mizo Hills in the south) were separated from Assam as union territories; both became states in 1986.
Since the restructuring of Assam after independence, communal tensions and violence remain. Separatist groups began forming along ethnic lines, and demands for autonomy and sovereignty grew, resulting in the fragmentation of Assam. In 1961, the government of Assam passed legislation making use of the Assamese language compulsory. It was withdrawn later under pressure from Bengali speaking people in Cachar. In the 1980s the Brahmaputra valley saw a six-year Assam Agitation triggered by the discovery of a sudden rise in registered voters on electoral rolls. It tried to force the government to identify and deport foreigners illegally migrating from neighbouring Bangladesh and to provide constitutional, legislative, administrative and cultural safeguards for the indigenous Assamese majority, which they felt was under threat due to the increase of migration from Bangladesh. The agitation ended after an accord (Assam Accord 1985) between its leaders and the Union Government, which remained unimplemented, causing simmering discontent.
The post 1970s experienced the growth of armed separatist groups such as the United Liberation Front of Asom (ULFA) and the National Democratic Front of Bodoland (NDFB). In November 1990, the Government of India deployed the Indian army, after which low-intensity military conflicts and political homicides have been continuing for more than a decade. In recent times, ethnically based militant groups have grown. Panchayati Raj Institutions have been applied in Assam, after agitation of the communities due to the sluggish rate of development and general apathy of successive state governments towards Indigenous Assamese communities.
Assam