- 
  
  Prince Norodom Sihanouk was the neutralist leader in Cambodia. He was overthrown on March 18 by the pro-US prime mi nister Lon Nol who was anti-communist.
- 
  
  
- 
  
  Nixon authorizes the Cambodian Incursion. The word "invasion" seemed to strong a word. The incursion was meant to reinforce that the US would not retreat. The Joint Cheifs of Staff promised victory.
- 
  
  Student and nonstudent protestors at Kent State University began intolerable and sometimes voilent rallies. They were against the Cambodian incursion which they believed was a widening of the war.
- 
  
  National Guardsmen fired at antiwar protestors at Kent State University. Four students were killed and several others were wounded.
- 
  
  American forces leave Cambodia. This created a void that forced the South Vietnamese and Cambodian armies to fill.
