Dark ages of Cambodia

After a long series of wars with neighboring kingdoms, Angkor was sacked by the Ayutthaya Kingdom and abandoned in 1432 because of ecological failure and infrastructure breakdown. This led to a period of economic, social, and cultural stagnation when the kingdom's internal affairs came increasingly under the control of its neighbors. By this time, the Khmer penchant for monument building had ceased. Older faiths such as Mahayana Buddhism and the Hindu cult of the god-king had been supplanted by Theravada Buddhism.

The court moved the capital to Longvek where the kingdom sought to regain its glory through maritime trade. Portuguese and Spanish travelers described the city as a place of flourishing wealth and foreign trade. The attempt was short-lived however, as continued wars with the Ayutthaya and the Vietnamese resulted in the loss of more territory and Longvek being conquered in 1594. With the capturing of Longvek by the Siamese, the nation never fully recovered. During the next three centuries, the Khmer kingdom alternated as a vassal state of the Ayutthaya Kingdom and Vietnamese kings, as well as short-lived periods of relative independence.

A new Khmer capital was established at Udong south of Longvek, but its monarchs could survive only by entering into what amounted to vassal relationships with the Siamese and Vietnamese. A renewed struggle between Siam and Vietnam for control of Cambodia in the nineteenth century resulted in a period when Vietnamese officials attempted to force the Khmers to adopt Vietnamese customs. This led to several rebellions against the Vietnamese. The Siamese–Vietnamese War (1841–1845) ended with an agreement to placed the country under joint suzerainty. This later led to the signing of a treaty for French Protection of Cambodia by King Norodom I.

Pre-Angkorian and Angkorian eras

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During the 3rd, 4th, and 5th centuries, the Indianised states of Funan and Chenla coalesced in present-day Cambodia and southwestern Vietnam. For more than 2,000 years, Cambodia absorbed influences from India, passing them on to other Southeast Asian civilizations that are now Thailand and Laos.The Khmer Empire flourished in the area from the 9th to the 13th centuries. Around the 13th century, Theravada Buddhism was introduced to the area through monks from Sri Lanka. From then on, Theravada Buddhism grew and eventually became the popular religion.

The Khmer Empire was Southeast Asia's largest empire during the 12th century and it remained very powerful. The empire declined yet remained powerful in the region until the 15th century. The empire's centre of power was Angkor, where a series of capitals was constructed during the empire's zenith. In 2007 an international team of researchers using satellite photographs and other modern techniques concluded that Angkor had been the largest pre-industrial city in the world with an urban sprawl of 1,150 square miles.The city could have supported a population of up to one million people and Angkor Wat, the most famous and best-preserved religious temple at the site, are reminders of Cambodia's past as a major regional power.