Explanation: Assam, a state in northeastern India, has several border disputes with its neighboring states, but the most significant and longest-standing dispute is with Nagaland. This dispute is rooted in the historical and cultural ties of the Naga people, who have a strong presence in both Assam and Nagaland. The Naga people have a long history of seeking greater autonomy and recognition of their cultural and political rights, which has led to complex territorial disputes.
The border dispute between Assam and Nagaland primarily concerns the delineation of the border between the two states. The Naga people have historically inhabited a region that spans across the current borders of Assam and Nagaland, leading to disagreements over which areas should be part of which state. This dispute is further complicated by the fact that the Naga people have a strong sense of identity and have sought greater autonomy and recognition of their rights.
The dispute has been ongoing for several decades and has involved various negotiations and agreements between the central government, the state governments of Assam and Nagaland, and the Naga people. Despite several attempts to resolve the issue, a permanent solution has not been reached, making it the longest and most significant border dispute involving Assam.
In contrast, the border disputes with other neighboring states such as Mizoram, Tripura, and Meghalaya are less significant and have not been as long-standing. These disputes, while important, do not carry the same historical and cultural weight as the dispute with Nagaland.
Understanding the context of the Naga people and their historical ties to the region is crucial to comprehending the significance of the border dispute between Assam and Nagaland. This dispute is not just about territorial boundaries but also about the recognition and rights of a culturally distinct group of people. Therefore, the correct answer is that Assam's longest border dispute is with Nagaland.