What issue did the Assam Accord successfully address, and what issue did it leave unresolved?

It successfully resolved the foreign national problem and left the issue of immigration unresolved.

Answer: It successfully resolved the foreign national problem and left the issue of immigration unresolved.

The Assam Accord brought peace and changed the face of politics in Assam by successfully addressing the foreign national problem, but it did not fully resolve the immigration issue.
After six years of unrest, the government led by Rajiv Gandhi engaged in negotiations with the AASU leaders, resulting in the signing of an accord in 1985. According to this agreement, individuals who had migrated into Assam during and after the Bangladesh war and subsequent periods were to be identified and deported. Following the successful conclusion of the movement, both the AASU and the Asom Gana Sangram Parishad reorganized themselves into a regional political party known as Asom Gana Parishad (AGP). This party came to power in 1985, promising to address the issue of foreign nationals and to foster the development of a 'Golden Assam.'

While the Assam accord brought peace and transformed the political landscape in Assam, it did not fully resolve the immigration problem. The issue of 'outsiders' remains a prominent concern in the politics of Assam and many other regions in the North-East. This problem is particularly pronounced in Tripura, where the original inhabitants have become a minority in their own land. Similar sentiments drive the local population's hostility towards Chakma refugees in Mizoram and Arunachal Pradesh.