once they destabilize cambodin vietnam. once they destabilize cambodio vietnam.they destabilize cambodius vietnam. once they destabilize cambodia vietnam. once they destabilize cambodia you really just have all hell breaking out. >> the cambodian operation will continue during the coming days. american units searching for north vietnamese troops and installations. but what they will find or how long they will be here no one can say for sure. >> the active, large scale american and south vietnamese fight in cambodia brought a cry of anger. at kent state, ohio, the protest turned into a riot with thousand of demonstrators facing national guardsmen and police. >> four students are killed at kent state. two students are killed at jackson state in mississippi. nixon is sort of overwhelmed. he is bewildered. nixon was very upset by the deaths, by the belief that he had caused them. and it was a low point of his presidency. >> the events of this past week have polarized not only the opposition to the war but also the opposition to the anti-war movement. >> hard hat cons