US bombers softened up targets during the last days of April 1970.
US ground units officially crossed the border on 01 May 1970.
The Kent State shootings occurred four days later, on 04 May 1970.
Vietnam and Cambodia
Cambodia was officially neutral during the war.
Cambodia was being invaded by both American and japenesse troops during their battles.
Laos and Cambodia.
The Japanese occupied French Indochina (now separated into Vietnam, Laos & Cambodia) during the Second World War.
During the Vietnam War, the war spilled over to Cambodia.
During the poopy war.
Vietnam and Cambodia
There are large tracts of forest in Cambodia, despite the deforestation campaigns waged on Cambodia during the American(vietnam)war. During the Vietnam War, there were many forests in Cambodia, Laos and South Vietnam. Only Airmen can report on forests for North Vietnam (they're the only ones that got to observe them).
Cambodia was officially neutral during the war.
Cambodia was being invaded by both American and japenesse troops during their battles.
Cambodia was officially neutral during the war.
Laos and Cambodia.
Cambodia was neutral.
The Japanese occupied French Indochina (now separated into Vietnam, Laos & Cambodia) during the Second World War.
The bordering countries of Laos & Cambodia were neutral.
I know of no illegal "rugs" that entered south Vietnam but there were illegal Drugs that did enter Vietnam.