I dont know the particulars but I would guess whites had something to do with this as well. Even if not its just a drop in the bucket when you look at all the white genocides.
The Khmer Rouge was made up of white folks?...LMAO
By default, yes. It was the US that made that possible.
THE KHMER ROUGE SEIZES CONTROL
In March 1970, General Lon Nol initiated a coup while Cambodia’s hereditary leader, Prince Norodom Sihanouk, was out of the country. A civil war then broke out in which Sihanouk allied himself with the Khmer Rouge and Lon Nol received the backing of the United States. Both the Khmer Rouge and Lon Nol’s troops purportedly committed mass atrocities. At the same time, about 70,000 U.S. and South Vietnamese soldiers stormed across the border to fight North Vietnamese and Viet Cong troops who had taken sanctuary there. U.S. President Richard Nixon also ordered a secret bombing campaign as part of the
Vietnam War. Over the span of four years, U.S. planes dropped 500,000 tons of bombs on Cambodia, more than three times the amount dropped on Japan during
World War II.
Pol Pot - Facts & Summary - HISTORY.com