Took me a lot of book clearings to finally get to this - SEA historically has been a strategic trade pathway, filled with tropical islands and generally a non confrontational society. It has amongst the oldest tribes in the world. The early civilization settlements were from SEA to America so you might see some feature similarities between both the natives. SEA is also rich with cultural mix as it was one of the most occupied lands in the world - by India, China, Mongolia, the kingdom of Majapahit, kingdom of Khmer, Spain, Portugal, Dutch, British, US, Japan, France - from the 1st century until the 20th century