There were many reasons.
For example:
-resources
-strategic locations
-land for the increasing population
-ideology
Answer: Angkor Wat lies 5.5 kilometres (3.4 mi) north of the modern town of Siem Reap, and a short distance south and slightly east of the previous capital, which was centred at Baphuon. In an area of Cambodia where there is an important group of ancient structures, it is the southernmost of Angkor's main sites.
Explanation:
Answer:
I would write how and why they developed and write about the thing they developed whatever it is
A. Some type of mass extinction event occurred during this time