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Cambodia becomes independent from France and becomes the Kingdom of Cambodia.
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Pol Pot became the leader of the CPK.
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The US begins a secret bombing campaign against North Vietnamese forces in Cambodia.
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Prince Norodom Sihanouk was overthrown. Prime Minister Lon Nol took his place.
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People who live in cities are forcibly moved to the countryside to become agricultural workers. Money becomes worthless, basic freedoms become scarce, and religion is banned. The Khmer Rouge use the phrase "Year Zero".
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Hundreds of thousands of educated middle-class citizens are tortured and executed in special centers. Other people starve or die from disease or exhaustion. The total number of deaths over the next three years is estimated to be at least 1.7 million.
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The country is re-named Democratic Kampuchea.
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Pol Pot becomes prime minister.
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Vietnamese forces invade in a lightning assault.
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Phnom Penh is taken by the Vietnamese. Khmer Rouge forces and Pol Pot flee to the Thailand border.
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The People's Republic of Kampuchea is established.
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A Pol Pot and Ieng Sary are found guilty of genocide.
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Lon Nol dies.
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Vietnamese troops withdraw.
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A peace agreement is signed in Paris.
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Pol Pot is put on trial by the Khmer Rouge and sentenced to life imprisonment.
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Pol Pot dies.
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The Khmer Rouge movement fully collapsed. All leaders had defected to the Royal Government of Cambodia, been arrested, or died.
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The tribunal began Case 002, trying three out of the four surviving top leaders of the Khmer Rouge.
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Ieng Sary dies.
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https://www.bbc.com/news/world-asia-pacific-13006828
https://www.cambodiatribunal.org/history/cambodian-history/chronology-of-the-khmer-rouge-movement/
http://www.cnn.com/2010/WORLD/asiapcf/07/25/cambodia.khmer.rouge.timeline/index.html
https://www.cambodiatribunal.org/history/cambodian-history/khmer-rouge-history/
https://www.britannica.com/biography/Norodom-Sihanouk
https://www.thefamouspeople.com/profiles/lon-nol-5993.php