Southeast Asia was under Southern Indian (Dravidian) influence starting around 200 BC until around the 15th century, when Buddhist influence was absorbed by local politics. Kingdoms in the south east coast of the Indian Subcontinent had established trade, cultural and political relations with Southeast Asian kingdoms in Burma, Thailand, Indonesia, Malay Peninsula, Cambodia and, to a lesser extent, Vietnam. Unlike the Hindu kingdoms within the Indian sub-continent, the Tamil kingdoms of the southeastern coast of the peninsula did not have culture restrictions on crossing the sea. This led to more exchanges through the sea routes into Southeast Asia. Whereas Buddhism thrived and became the main religion in many countries of the Southeast Asia, it died off on the Indian subcontinent.
other states in southeast asia that were influenced by india include
Burma Thailand Indonesia Malay Peninsula Cambodia Vietnam