Explanation: Assam and Nagaland, both located in the northeastern part of India, have a complex history of relations marked by periods of conflict and peace. The primary reasons for these conflicts have been border disputes, resource management, and political tensions.
The history of Assam and Nagaland's relationship can be traced back to the formation of Nagaland as a state in 1963. The creation of Nagaland led to significant border disputes with Assam, as the new state's boundaries were not clearly defined. This resulted in several clashes and conflicts in the subsequent years, particularly in 1968, when the border issues were at their peak.
In 1985, the situation further deteriorated due to the ongoing border disputes and the struggle for resources, especially in the areas of coal and timber. The year 1985 is noted for significant clashes and tensions between the two states.
However, the year 2004 stands out as a period of relative peace and stability between Assam and Nagaland. This was due to several factors, including improved diplomatic relations, the implementation of peace agreements, and a general reduction in the intensity of border disputes. The government of India and the state administrations took steps to address the underlying issues and promote a peaceful coexistence between the two states.
In contrast, 2014 saw a resurgence of minor conflicts and tensions, primarily due to unresolved border issues and resource management disputes. This year is not considered a period of peace between the two states.
Understanding the historical context and the specific events of each year is crucial to identifying the correct answer. The year 2004 is the only option that represents a period of relative peace and stability between Assam and Nagaland, making it the correct answer to the question.