The people of the plains of the Brahmaputra and Barak valleys are mainly of Indo-Iranian ancestry. By the time of their arrival in the region, however, the local Aryan peoples had become intermixed with Asiatic peoples. The Ahom people, who arrived in the region from mainland Southeast Asia during the 13th century, ultimately stem from Yunnan province of southern China. A significant minority of the population consists of rural Indigenous peoples who fall outside the Indian caste system; as such, they are officially designated as Scheduled Tribes. The Bodo constitute the largest of these groups. Most of the Scheduled Tribes ...(100 of 3955 words)