evidence: ARUNACHAL PRADESH Arunachal Pradesh, "Dawn's Province," is the most northeasterly and most sparsely populated state in India, containing just over 1 million people. Carved out of Assam, it is nearly 84,000 square miles (about 217,500 sq. km); it borders Assam and has an international border with Bhutan, China, and Myanmar. The state is mountainous, with the Himalayas along its northern border, and mountain ranges running north-south, creating five river valleys: the Kameng, Subansiri, Lohit, Tirap, and the Siang, containing the mightiest river. With the heaviest rainfall in India, the state is hot and humid, with temperatures as high as 107 degrees Fahrenheit (42°C) in the summer in the valleys but considerably cooler in the higher altitudes. [...] Under India's Constitution, adopted 26 January 1950, the area remained autonomous under district councils. In 1954 the area became the North-East Frontier Area under the governor of Assam. In 1962 China invaded India through the state, and New Delhi realized how vulnerable it was to attack from the north. Accordingly, India absorbed Arunachal as a union territory on 20 January 1972, and it was renamed Arunachal Pradesh. An elected legislative assembly was constituted, and the first general election was held on 3 January 1980. On 20 February 1987 it became the twenty-fourth state of the Indian union. Divided into sixteen districts, the capital is Itanagar.