It strikes me as odd that the most successful federations throughout history of Southeast Asia centered around the Strait of Malacca. Those federations include Srivijaya, Negeri Sembilan, the Federated Malay States, Malaya and later Malaysia. I am unaware of any other federation that exist outside the link between Srivijaya and Malaysia. Is there something about the people of this area that prefer a federated form of government instead of unitary states?
At first glance, I think culture and other deterministic factors like tried form of governance which later reinforced local culture are the answers. I would really love to visit it soon. I find it hard to resort to coincidence; coincidence sounds like a lazy man’s answer.
In the meantime, I would appreciate if you, dear readers, could offer your thoughts on the matter.