alternatehistory.com

One of the most powerful SEA states declined massively and overtaken by Burma, Thailand and Vietnam.
The major theories out there:
1. Thai invasions
2. Environmental collapse: Deforestation and large irrigation system were unstable without highly competent administration
3. Black death
4. Conversion from Hinduism to Theravada Buddhism.


My hypothesis is that nature of mandala-feudal system prevented adequate administration and integration of outlying regions of the empire, leading to underdevelopment, mismanagement and political instability allowing the Thai peoples to pose a threat to Angkor and leading to social collapse and supplanting of Hinduism by Theravada Buddhism.
However these are my thought.
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