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They united under the "universal ruler" Jayavarman II.  The Khmer Empire lasted until 1431.

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By 1250, rice fed Angkor's population of 1.5 million and produced a huge surplus for support.

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The Khmer Empire reached its peak with Jayavarman VII, who reigned from 1181 to 1218.

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He built new road systems and a new capital called Angkor Thom.  He supported Buddhism and built 20,000 Buddhist shrines. The government assisted 300,000 monks and priests.

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A Thai army seized the city of Angkor.  The empire was shifted south and its power declined as the capital was left behind.