Arunachal pradesh

 There are practically no records relating to the earlier history of this area except some oral literature and the number of historical ruins found mainly in the foothills dating approximately from the early Christian era.  The earliest recorded history dates back to 16th century AD when Ahom rulers of Assam extended their kingdom to this region. The Ahom rulers had a tradition of not interfering in the affairs of the tribes of this region. The British continued this policy, and in 1873, they banned entry of outsiders to this region. The Government of India continued this policy until 1962, when China attacked this region. After 1962, steps were taken to counter future border disputes with China, and roads, electricity, modern democratic institutions, and cash economy were introduced here. Before 1962, the state was known as Northeast Frontier Agency and was constitutionally a part of Assam. Because of its strategic importance, it was administered by the Ministry of External Affairs until 1965 and subsequently by the Ministry of Home Affairs through the governor of Assam. In 1972, Arunachal Pradesh was constituted as a union territory, and, in 1987, it became the 24th state of the Indian Union.