Who massacred 21% of Cambodia's population?

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Pol Pot

The killing fields document death. From 1975 to 1979, Pol Pot and his Khmer Rouge soldiers killed 1.7 million Cambodians, or 21 percent of the population, according to Yale University's Cambodia Genocide Program.

Explanation:

b. second continental congress

frederick william of brandenburg-prussia trained his son, frederick, to be a hardy soldier. but frederick disliked rifle shooting and horseback riding. unlike his father, he was interested in french literature. he enjoyed poetry and music and, like some others of the enlightenment, he scoffed at religion. his father thought him soft, frivolous and unmindful of his duties. and when frederick refused to put his signature on a right to succession, for a few moments his father strangled him.