Explanation:

Assam and Mizoram have sought to ease tensions along the border

=> The two States share a 164.6-km volatile border and the conflict is decades-old.

At the center of the dispute are two notifications- 1875 and 1993:

=> Mizoram claims that the land is theirs is based on an 1875 notification, which came from the Bengal Eastern Frontier Regulation Act of 1873.

=> Assam claims that the land is theirs based on a 1933 notification that demarcated the Lushai Hills, which Mizoram was formerly known as, from the province of Manipur.