Page "Vietnamization" Paragraph 28

The incursion prevented the immediate takeover of Cambodia by Pol Pot and his Khmer Rouge, and cost the PAVN the supply line from the port of Sihanoukville.

The Khmer Rouge broke with its North Vietnamese sponsors, and aligned with China.

This made American involvement visible to the U. S. population, and there were intense protests, including deaths in a confrontation between rock-throwing protesters and National Guardsmen at Kent State University.