The Southeast Asians you are familiar with came originally from China, in at least five waves of migration: the Austronesians or Malays, the Mon-Khmers, the Vietnamese, the Tibeto-Burmans and the Thais. In this episode we will follow the Malay and Mon-Khmer migrations. Then when the Mons make contact with India, we will see Indian civilization introduced to nearly all of Southeast Asia, setting the stage for the rise of the first Southeast Asian states.

This map from Wikimedia Commons shows the path taken by the Austronesians during their great migration. Recent research has changed some of the dates, but otherwise the map is reliable.