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The first known kingdom in the 'Lower Mekong River' region, Funan(the capital city), rises and declines.
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There was evidence of trade found between the Khmer empire and the Indian culture. This was proven from finding Indian culture within the Khmer Empire. Eg. Hindu statues
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The state of Chenla increases and eventually replaces the city Funan as the dominant kingdom.
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Jayavarman II unites the smaller states of the 'scattered' empire to create one large empire. The Capital is located in the Angkor region of Cambodia
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Jayavarman II claimed himself to be a Deveraja(God-King) at the "sacred Mount Mahendraparvata to celebrate the independence of Kambuja from Javanese dominion"(https://en.wikipedia.org/wiki/Jayavarman_II#Universal_monarch [first paragraph]).
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Khmer empire rapidly expands and Angkor Wat is planned and constructed. Buddhism becomes the dominant religion.
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The Cham kingdom invades much of the Eastern territory of the Khmer Empire over a period of time.
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Jayavarman VII defeates the Chams and enlargens the Khmer Empire to the furthest extent which incorporates much of present-day Thailand, Burma and Laos.
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Jayavarman VII changes the leading religion: Buddhism to hinduism and orders that all Buddhist temples and images be destroyed and Hinduism became the main religion.
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For the second time, Buddhism grew and became the stronger religion for the second time. It grew from Chenla (Funan) and made it's way to the the heart of the empire where Jayavarman II transitioned to Buddhism.
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The Thais repeatedly attacked Angkor Wat and eventually took ownership of the capital. The Khmers abandoned Angkor and ran to safety and to find their new capital.
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The Khmer Empire abandon Angkor Wat after the Thais had repeatedly attacked for ownership. Over a number of centuries, the jungle grew around and over Angkor Wat and it's whereabouts was unknown.
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Khmer rulers relocate their capital city after being attacked by the Thais repeatedly. They relocated to Phnom Penh.
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The Khmer empire were invaded by the Siamese and defeated.
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The Vietnamese armies repeatedly attack Khmer Empire near Mekong river delta and eventually defeat the Khmer. The modern borders of Cambodia were formed.