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Thailand first appeared in the 500s as a frontier people in China
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In the mid 1200s, Thai groups moved southward to Thailand, encouraged to do so by the Mongol invasion of China
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The Angkor and the Thai fought during both of their migrations and they destroyed the capital of Angkor in 1432
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On the Chao Phraya river, the Thai set up their own capital at Ayuthaya. They remained theere for the next 400 years.